CHICAGO — Now 81, Bob Gaudio was the keyboardist and a vocalist for the Four Seasons and co-wrote many of the group’s hits, ...

It seems like somebody’s idea of a joke: a song called “Walk Like A Man,” delivered in a falsetto wail so piercing that it sounds like someone doing a really nasty impersonation of a toddler.

The original quartet of Valli, Bob Gaudio, Tommy DeVito and Nick Massi was formed in 1960, growing out of a previous band, The Four Lovers. They achieved remarkably rapid success, releasing No. 1 ...