Oh, you know, Penn has always played bass. He released an album with his band "Bongos, Bass & Bob" back in 1988, long before his residency in Vegas. Is he a better bassist than Mike Jones on piano? Sure, probably not. But he was in no way a neophyte. He's played bass in his act for literally decades! He's a hype man! He's hyping up his pre-show. You know, I'd like to play bass before doing a show in Vegas and good for him, but sheesh.