Crossword puzzle clue "first part of a song"

First word across in the first-ever crossword (1913) and the first of a dozen appearances of the word in this puzzle's grid, written word search-style (left, right, down, and diagonally) ... Can you f

First part of a song

"The ___ Song" (familiar name of the Gary Glitter song "Rock and Roll Part 2" often played at sports events)

Part of a song that gets reused by another song

Party of the first part and party of the second part, e.g.

Part of a cassette with the first part of an album