Notation in the tenor and bass clefs, no transposition. All three trombone parts are usually written in tenor clef for the upper register and in bass clef for the lower.
Although the bass trombone is tuned to Bb/F, music written for it does not take this into account: the sound is as written. The instruments in the trombone family are tuned to different keys – the alto trombone is in Eb, the bass trombone in Bb/F, the contrabass trombone in Bb. This means that the musician must use a different fingering whenever he changes instruments. The bass trombone’s fingering is particularly challenging, because the fundamental pitch can be lowered from Bb1 to F1 by means of a fourth-valve and, depending on the instrument, to Eb1 or D1.