The 77-year-old singer-songwriter David Crosby’s argument that performing keeps musicians youthful certainly applies to Frankie Valli. The legendary New Jersey singer is 84, yet pulls off a two-hour show with more than two dozen songs, many of them standards, delivering a joyous celebration of pop music at its sweetest and purest.

Valli doesn’t need new material when his catalogue of smashes ranges from the doo-wop days to the disco era and – with the original Four Seasons long disbanded – a new, youthful band and harmony singers can render them to perfection. The hit Four Seasons musical Jersey Boys has given him a much younger audience, who respond to hits such as Rag Doll, Walk Like a Man, Sherry, Let’s Hang On and the rest with rapturous chants of, “There’s only one Frankie Valli.”