B♭3 Trombone Position
How to play B♭3 on the trombone: 1st position. — on the 4th partial, in bass clef, sounding exactly as written.
The diagram shows the trombone from the side with the slide pointing down: the dark bar is the slide brace, and it stops at the numbered marker for this note's position — the slide is all the way in, resting gently against the stops. The staff is in bass clef, the trombone's home clef, and in bass clef the trombone sounds exactly as written.
Hear B♭3 and try the position
Pick an instrument and a note and the diagram updates instantly — filled keys are the ones you press. The same finder sits on every note page, pre-set to that note.
The B♭3 position, step by step
- Move the slide out to 1st position — the slide is all the way in, resting gently against the stops.
- First position is the home position: every harmonic of the open tube is available here, and your lips and air choose which one sounds.
- Check the pitch against the harmonic: if the note will not speak cleanly, the slide is usually close and the lips are aiming at the wrong partial — re-centre the buzz before moving the slide further.
In short: 1st position.
Alternate position for B♭3
5th position.
One of the classic alternates: on the D4 harmonic, it keeps the slide in 5th-position territory for G♭- and D♭-centred passages. Because it rides the flat 5th partial, sit it a touch short of the full 5th-position landmark.
About B♭3 on the trombone
The middle register is the trombone’s home territory — the 4th, 5th and 6th partials, where school band music mostly lives. This is where the classic alternate positions appear (F3 in 6th belongs to the register below, but B♭3 in 5th and D4 in 4th are here), and where the flat 5th partial has to be managed: its notes sit about 14 cents low and want the slide a touch in from the landmark.
B♭3 in 5th position — on the D4 harmonic — is the second of the classic alternates. It keeps the slide out in 5th-position territory for passages built around G♭ and D♭, instead of shuttling back to 1st between every note.
B♭3 is note 13 of the 32 in the full trombone slide position chart, sitting between A3 below it and B3 above it. Like every position on this site, it was checked against Yamaha’s official chart and the NoteAtlas slide position chart before publishing.
Practising B♭3
Practise this note against a tuner, and if it belongs to the 5th partial (B3 to D4), expect to sit a little inside the textbook landmark. Then play it in a phrase — position is a habit of the arm, not a measurement.
Questions about B♭3
What position is B♭3 on trombone?
1st position. B♭3 is played on the 4th partial (harmonic) of the trombone's tube in the middle register. The full step-by-step is on this page, and you can hear the note with the Fingering Finder.
Does B♭3 sound as written on trombone?
Yes. In bass clef the trombone is a non-transposing instrument, so written B♭3 sounds as concert B♭3 — the same pitch a piano plays. Only brass-band treble-clef parts transpose.
Is there an alternate position for B♭3?
Yes — 5th position. One of the classic alternates: on the D4 harmonic, it keeps the slide in 5th-position territory for G♭- and D♭-centred passages. Because it rides the flat 5th partial, sit it a touch short of the full 5th-position landmark.
Think this position is wrong? Report it — every report is checked against the source charts.