Conversation so far:
who sings can't take my eyes off of you
Can't Take My Eyes Off You was recorded as a single by Frankie Valli.
who else sang can't take my eyes off of you besides frankie valli
Can't Take My Eyes Off You has been recorded by some 200 artists over the years, in many countries. Some artists include The Lettermen and Andy Williams.

Question: was frankie the first one to sing the song
Self-contained rewrite: was frankie valli the first artist to sing can't take my eyes off of you