A functionality can both be planned out and rehearsed (practiced)—that is the norm in classical music, jazz large bands, and many well-liked music types–or improvised about a chord progression (a sequence of chords), which is the norm in small jazz and blues teams. Rehearsals of orchestras, live performance bands and choirs are led by a conduct

In classical music, instrumental performers, singers or conductors could little by little make variations towards the phrasing or tempo of a bit. In preferred and conventional music, the performers have additional flexibility for making variations to the shape of a song or piece. Therefore, in well known and classic music variations, even if a band