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

"Opus 17 (Don't You Worry 'bout Me)"
Single by The Four Seasons
from the album 2nd Vault of Gold Hits
B-side	Beggar's Parade (from the album Workin' My Way Back to You and More Great New Hits)
Released	May 1966
Format	7"
Genre	Rock
Length	2:32
Label	Philips
Writer(s)	Sandy Linzer-Denny Randell
Producer(s)	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. 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.

This was the first hit with new full-time bassist/bass vocalist Joe Long.

The title was the result of being the 17th single released by the Four Seasons.

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 except in the Coda section by Frankie Valli.

This song ties Bobby Darin's "Mack The Knife" for the most chromatic key changes in a rock or pop song. The song starts in the key of F# and modulates five times until reaching its ending key of B.