Question

What is a reprise such as a part of a musical

Answer 1

is the repetition or reiteration of the opening material later in a composition as occurs in the recapitulation of sonata form, though—originally in the 18th century—was simply any repeated section, such as is indicated by beginning and ending repeat signs.

Answer 2

a reprise is the repetition or reiteration of the opening material later in a song