The Four Seasons

[Brumbiter]

Once Frankie Valli left in the mid-1970s, who sang lead vocals on hits such as "Silver Star," "Rhapsody" and "Down The Hall?"

[198x]

This is taken from The Four Seasons wikipedia page :

In1975 the new lineup boasted two new lead singers in Don Ciccone (formerly of The Critters) and Gerry Polci, who eased the singing load on an ailing Frankie Valli.

Although it doesn't actually say that Frankie left the band in the mid 70's, just that he also had solo hits.

[Kevinflick]

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