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Probably a female vocalist since you pitched it in soprano register, or the dude from The Stylistics, lol...or Frankie Valli...not...

This song was recorded by a male group, with at least one member a tenor. Though I wouldn’t say they were known for their voices, like the Vogues or something. Clue: a ‘60s song that reached #3 U.S. and #1 in Canada. Name the song, group, and songwriter(s).