A bass run (or "bass break") is a short instrumental break or fill in which the bass instrument, such as an electric bass or a double bass (or instruments, in the case of a marching band) and the bassline are given the forefront. The bass part for a bass run often differs from the usual bass accompaniment style, in terms of the register, timbre, or melodic style that is used, or the number of notes per beat which are played.
A bass run may be composed by the performer or by an arranger prior to a performance, or it may be improvised onstage by the performer using scales, arpeggios, and standard licks and riffs.In some cases, a bass run may incorporate a display of virtuoso techniques such as rapid passages or high notes. During a bass run, the main vocal or melody line usually stops, and in some cases, the percussion or drums may also stop.
