think they have, as a matter of fact. >> half are instrumentals, but half are guest singers. >> jimmy: yeah. sharon going to sing. >> jimmy: fantastic. she's great. >> she's absolutely great. and fiona apple. [cheers and applause] has she been here? >> jimmy: she has, indeed. >> i love her. gregory porter. you know gregory porter? >> jimmy: yes. >> he sings with us, and miley cyrus. >> jimmy: i've heard of her as well. >> has she been on the show? >> jimmy: she has been here many times. is she the most famous person you've played music with? >> probably, although i'm thinking back, one time, you know who i sat in with? >> jimmy: who? >> aerosmith. >> jimmy: wouw, wow, that's a good one. >> they were doing a concert in some 80,000-seat arena they filled up. and i was on one side of the stage, for whatever reason, i met them on "saturday night live," tom arnold brought me to this concert in a helicopter. >> jimmy: was schwarzenegger flying it? no? >> at the end of the show, steven tyler said okay, jeff, are you going to play with us or what? i was like, whaaaa? i stepped up there and the piano player