"Opus 17" is a song composed by Sandy Linzer and Denny Randell and recorded by The Four Seasons

The Four Seasons (group)

The Four Seasons are an American rock and pop band who became internationally successful in the mid-1960s. The Vocal Group Hall of Fame has stated that the group was the most popular rock band before The Beatles...

 in 1966 for their album

LP album

The LP, or long-playing microgroove record, is a format for phonograph records, an analog sound storage medium. Introduced by Columbia Records in 1948, it was soon adopted as a new standard by the entire record industry...

 Working My Way Back to You. The song was released as the official followup to the title song of the album

Working My Way Back To You

"Working My Way Back to You" is the debut single from Irish Boyband Boyzone. It was released in May 1994. The song reached #3 on the Irish Singles Chart. It is one of the few songs to feature Mikey Graham on lead vocals. The band recorded two versions the song, one of which was a collaboration with...

 and reached the #13 position on the Billboard

Billboard (magazine)

Billboard is a weekly American magazine devoted to the music industry, and is one of the oldest trade magazines in the world. It maintains several internationally recognized music charts that track the most popular songs and albums in various categories on a weekly basis...

Hot 100 singles chart.

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

Joe Long

Joe Long is best known as the bass guitarist for The Four Seasons....

.

As was the case with another Linzer-Randell contribution to the Four Seasons catalog, "Let's Hang On!

Let's Hang On!

"Let's Hang On!" is a song composed by Bob Crewe, Sandy Linzer, and Denny Randell that was popularized by The Four Seasons in 1965. The single reached the number three position in the Billboard Hot 100 singles chart, the group's highest placement since "Rag Doll" hit the top spot in July 1964.This...

", "Opus 17" features a rhythmic vocal hook

Hook (music)

A hook is a musical idea, often a short riff, passage, or phrase, that is used in popular music to make a song appealing and to "catch the ear of the listener". The term generally applies to popular music, especially rock music, hip hop, dance music, and pop. In these genres, the hook is often...

 within each verse, but, unlike in most Four Seasons singles, falsetto singing is muted.

This song ties Bobby Darin

Bobby Darin

Bobby Darin , born Walden Robert Cassotto, was an American singer, actor and musician.Darin performed in a range of music genres, including pop, rock, jazz, folk and country...

's "Mack The Knife

Mack the Knife

"Mack the Knife" or "The Ballad of Mack the Knife", originally "Die Moritat von Mackie Messer", is a song composed by Kurt Weill with lyrics by Bertolt Brecht for their music drama Die Dreigroschenoper, or, as it is known in English, The Threepenny Opera. It premiered in Berlin in 1928 at the...

" 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.