 As a consequence, the discouraged group temporarily disbanded.In 1958, Valli met record producer Bob Crewe at a recording session, who signed the Four Lovers to a three-year artist contract.During this period, the reconstituted quartet had some significant personnel changes, as bassist/vocalist Nick DeVito left the group in 1958, to be replaced by Nick Massi for just a few months, then by bassist/arranger Charles Calello until 1960, and then by Massi again.