The Wonder Who? was a nom de disc of The Four Seasons for four single records released in 1965 and 1966. It was one of a handful of "names" used by the group at that time, including Frankie Valli (as a "solo" artist even though the Four Seasons were present on the record) and The Valli Boys. Wonder Who? recordings generally feature the falsetto singing by Valli, but with a softer falsetto than on "typical" Four Seasons recordings. Read more on Last.fm