Opus 17 (Don't You Worry 'Bout Me)

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“Opus 17 (Don't You Worry 'Bout Me)”
Single by The Four Seasons from the album Second Vault of Gold Hits
B-side	Beggar's Parade
Released	May 1966
Format	7"
Genre	Rock
Length	2:32
Label	Philips
Writer(s)	Sandy Linzer-Denny Randell
Producer	Bob Crewe
The Four Seasons singles chronology
Peanuts (as The Wonder Who) (1966) Let's Hang On! (1966) On The Good Ship Lollipop (as The Wonder Who?) (1966)

"Opus 17 (Don't You Worry 'Bout Me)" is a song composed by Sandy Linzer and Denny Randell and recorded by The Four Seasons in 1966 for their album Working My Way Back to You. Produced by Bob Crewe, the song was released as the official followup to the title song of the album and reached the #13 position on the Billboard Hot 100 singles chart.

As was the case with another Linzer-Randell contribution to the Four Seasons catalog, "Let's Hang On!", "Opus 17" features a rhythmic vocal hook within each verse, but, unlike in most Four Seasons singles, falsetto singing is muted.

This song ties Bobby Darin's "Mack The Knife" for the most chromatic key changes in a pop song.^{[citation needed]} The song starts in the key of F# and modulates five times until reaching its ending key of B.