Frankie Valli at Radio City Music Hall

 

I don't know if this recording is legal.  If not, YouTube will delete it.  Some people think that Frankie lip-syncs at his concerts.  I can't tell for sure. He had four backup singers that you can call the Four Seasons, but likely, the original members of the group have passed away.  The Wikipedia entry linked above lists current and past members of the group.  He sang his solo and group hits including:

• Grease
• Let's Hang On
• Walk Like a Man
• Tell it to the Rain
• Opus 17
• Big Girls Don't Cry
• Oh What a Night (December 1963)