▸ noun
1 (in jazz and popular music) a short, simple introductory passage, usually repeated several times until otherwise instructed:
the title track has an overlong vamp.
▸ verb
– ORIGIN Middle English (denoting the foot of a stocking): shortening of Old French avantpie, from avant ‘before’ + pie ‘foot’. The musical sense of the verb developed from the general sense ‘improvise’.