B5 is a power chord chord, and on the mandolin it is played from the notes B, F#. Its first mandolin voicing is a barre chord at fret 2: G string at fret 4 (middle finger); D string at fret 4 (middle finger); A string at fret 2 (index finger); E string at fret 2 (index finger). This page is a complete reference for it: notes and intervals, fingerings, mistakes to avoid, the keys it belongs to and a short practice routine.
What notes are in the B5 chord?
The B5 chord is a power chord chord, and its notes are fixed: B, F#. Every voicing on every instrument uses these same notes, in some order and in some octave — change one of them and you are playing a different chord. The table below lists each note with its interval from the root B, so you can see the structure of B5 at a glance. On the mandolin, start with the first voicing above and listen for the notes B, F# in B5.
| Note | Interval |
|---|---|
| B | Root |
| F# | 5 |
The root is B, the note the chord is named after and the note your ear hears as home. Above it, the intervals in B5 are 5. Once you know the intervals, you can build B5 from any root by counting the same semitone steps, which is how the chord works in every key. On the mandolin, the notes appear in the order the fingering dictates, but the set of notes never changes.
B5 sounds powerful, open and ambiguous — with no 3rd, the power chord is pure root and 5th, and it can fit over major or minor. The colour is strongest when all the notes ring clearly. A muted chord tone, especially the 3rd or the 7th where the chord has one, flattens the character of B5 noticeably. On the mandolin, the barre chord voicing is the place to hear it in B5.
Comparing B5 with its closest relatives helps to fix it in your ear. In short, power chord against a full triad: B5 has only B, F# — root and 5th. Add the 3rd D# and it becomes major; add D and it becomes minor. Hearing the comparison matters more than reading it: play B5, then play the chord it is compared with above, and let your ear find the note that changed. On the mandolin, start with the first voicing above and listen for the notes B, F# in B5.
How to play B5 on mandolin
On the mandolin, B5 has 3 voicings in the data below, and each one uses the same notes — B, F# — in a different place on the neck. Start with the first voicing and get it clean before you try the movable shapes further up the neck. Finger numbers below use 1 for the index finger, 2 for the middle finger, 3 for the ring finger and 4 for the little finger, and x means the string is not played.
For the barre chord, B5 sits in around fret 2: G string at fret 4 (middle finger); D string at fret 4 (middle finger); A string at fret 2 (index finger); E string at fret 2 (index finger). It barres across strings 3 to 4 at fret 2 with the index finger. The barre is the hard part: the index finger must press every string from 3 to 4 evenly at fret 2, so roll it slightly onto its bony side and keep it close to the fret wire. If the barre buzzes, move it a fraction closer to the fret and press from the arm, not the thumb alone. Strum or pluck it slowly first and check that every note in B5 — B, F# — sounds, with no buzz and no accidental open string.
Another way to play B5 is the movable voicing, in around fret 2: G string at fret 4 (middle finger); D string at fret 4 (middle finger); A string muted; E string at fret 2 (index finger). The challenge here is the muted string: 1 string is marked x, and it needs to stay silent. Let the edge of a fretting finger rest lightly on it — muting by touch, not by pressing. Strum or pluck it slowly first and check that every note in B5 — B, F# — sounds, with no buzz and no accidental open string.
For the movable voicing, B5 sits in around fret 2: G string at fret 4 (middle finger); D string at fret 4 (middle finger); A string at fret 2 (index finger); E string muted. The challenge here is the muted string: 1 string is marked x, and it needs to stay silent. Let the edge of a fretting finger rest lightly on it — muting by touch, not by pressing. Strum or pluck it slowly first and check that every note in B5 — B, F# — sounds, with no buzz and no accidental open string.
Choosing between the voicings of B5 is a musical decision, not a right-or-wrong one. The open or low-position voicing rings the most and suits strumming, while a barre or movable voicing lets you slide B5 up the neck to any key without changing the shape. When you change chords, pick the voicing of B5 that sits closest to the chord before it — shorter moves between shapes mean faster, cleaner changes. Practise the change into B5 from the chord that comes before it in your song, not the chord on its own, because the move is the skill. On the mandolin, the barre chord of B5 puts those notes under your fingers in the order the fingering lists them.
A short practice routine for B5 on the mandolin: play the first voicing four times slowly, checking each note, then change to it from the chord a fourth above B and back, four times, at a slow tempo. Then play the second voicing the same way. If a note buzzes, stop and fix the finger placement rather than playing through the buzz — clean notes at a slow tempo become clean notes at full tempo, while buzzes practised fast become habits. Use the Mandolin Chord Finder to see the diagram for B5 while you practise, and the Chord Finder to compare it with the same chord on other instruments.
Common mistakes
These are the mistakes that most often make B5 sound wrong on the mandolin, and each one has a concrete fix. Work through them one at a time rather than trying to fix everything at once.
Letting open strings ring. Open strings that are not part of the chord blur the sound. Mute them with the edge of your fretting hand. On the mandolin, start with the first voicing above and listen for the notes B, F# in B5.
Playing it too slowly. Power chords are about rhythm and movement. Practise changing them on the beat, not between beats. On the mandolin, the barre chord of B5 puts those notes under your fingers in the order the fingering lists them.
Using it where a triad is needed. B5 has no 3rd, so it cannot carry the major-or-minor information a melody sometimes needs. Use full triads in clean, melodic passages. On the mandolin, the barre chord of B5 puts those notes under your fingers in the order the fingering lists them.
Missing one string of a course. Mandolin strings come in pairs, and B5 needs both strings of each course to sound. If one string of a pair is muted by a neighbouring finger, the chord sounds thin. Check each course separately by plucking it on its own. On the mandolin, start with the first voicing above and listen for the notes B, F# in B5.
Where B5 is used
B5 is not a diatonic triad in any major or minor key, because it is an extended or altered chord, but its base triad belongs to the key of E major, the key of F# major, the key of B major. a neutral chord that works over major or minor, since it contains no 3rd. As a dominant-type chord it also points toward E major, the key a perfect fourth above B, which is the tonic it most often resolves to. That is where B5 does its work: not as a home chord, but as a chord that creates movement and then resolves. On the mandolin, start with the first voicing above and listen for the notes B, F# in B5.
Because B5 is an extended or altered chord, it appears in progressions as a colour or a dominant rather than as a diatonic staple. Try it in place of the plain B triad in a progression you already know, and listen to how the extra notes change the feel — that substitution is the usual way extended chords enter real music. The Chord Progression Builder lets you try B5 in a progression in any key and hear how it connects to the chords around it. On the mandolin, the barre chord voicing is the place to hear it in B5.
The same chord on other instruments is covered in B5 on guitar, B5 on piano, B5 on ukulele, and the scales that fit over it are the B major scale and the B minor pentatonic scale. Learning B5 on the mandolin and then checking it on another instrument is one of the best ways to fix the notes — B, F# — in your memory, because the notes stay the same while everything else changes.
Practising B5
A short worked example makes B5 concrete. Play the four-chord progression E – B – C#m – A in E major, the key B5 most often resolves toward: E – B – C#m – A. Play each chord for one bar at a slow tempo, and listen to how B5 sounds in that sequence — whether it feels like home, like a lift, or like a chord on its way somewhere else. Then play the same four chords in a different order, starting on B5 itself, and notice how its character changes when it opens the progression instead of sitting inside it. On the mandolin, the barre chord voicing is the place to hear it in B5.
For a second exercise, play B5 and then the chord a fourth above B, back and forth, four times each. That move — a chord and the chord a fourth above it — is the most common resolution in Western music, and it is the move B5 is built for when it acts as a dominant. Finish by playing B5 on its own, slowly, and naming each note out loud as you play it: B, F#. Naming the notes while you play them is what turns a shape into knowledge you can use in any key. Test yourself with the Practice Chord Quiz and keep time with the Metronome as the tempo rises. On the mandolin, the barre chord voicing is the place to hear it in B5.
Frequently asked questions
What notes are in B5?
Just two: B, F#. The root B and the perfect 5th F#. Some voicings add the root an octave higher, but the chord itself is only those two pitch classes. On the mandolin, the first voicing above shows where that note sits.
How do you play B5 on the mandolin?
The first voicing is the barre chord: frets 4–4–2–2, fingers 2–2–1–1, on the mandolin. That voicing uses the notes B, F#, and it is the one to learn first. The page above lists more voicings for B5, so you can choose the shape nearest the chords around it.
Is B5 hard to play on the mandolin?
It depends on the voicing. The first voicing of B5 on the mandolin is the easiest starting point, and the movable voicings further up the neck are harder because they need a barre or a wider stretch. Practise the first voicing cleanly at a slow tempo before you try the others, and the harder shapes will come more easily.
What is the easiest voicing of B5 on the mandolin?
The barre chord is the easiest voicing listed for B5 on the mandolin: frets 4–4–2–2, fingers 2–2–1–1. Learn that shape first, get every note ringing cleanly, and only then move on to the alternative voicings further up the neck.
Is B5 major or minor?
Neither. B5 contains only B, F# — the root and the perfect 5th — so it has no 3rd to make it major or minor. That is why it works over both. On the mandolin, the first voicing above shows where that note sits.