Wolf Pack

From Tardis Wiki, the free Doctor Who reference

The Wolf Pack was a famous group of singers made up of Frankie Seneca, Dino Martinelli and Solly Dancer. They performed frequently at the Sands Hotel in 1963, and tickets for their performances were highly sought after.

When Clara Oswald found one of these tickets in a drawer, the Twelfth Doctor took her to Las Vegas to see them perform. (COMIC: Gangland)