. >> people worry about things and it doesn't matter howell vated you get or your reputation gets.ill worry about things. >> reporter: what are you worried about? what else do you have to prove? >> i've heard people say he just wants to be liked. and i'm going, doesn't everyone? >> reporter: do you know now more than you did then? >> no. when we were famous with the beatles and we did revolver,y. i thought it was out of tune. i thought the whole album was out of tune. i listened to it. for some reason, i went to the guys and i said, it's out of tune, i don't know what we're going to do. you know. they said -- they got a bit worried. listened to it. they said no it isn't. i go, ok. ♪ ♪ r0i >> reporter: we were with mccartney preparing to tour. the beatles played this club almost 300 times and while mccartney's fans know every word to hey jude, yesterday, and band on the run, we were surprised who didn't. >> what i'm doing shows i listen to a lot of music, beatles music, wings music to see what ones we're going to do and to learn them. >> reporter: what do you mean? you've forgotten