Time Machine: 1 trip back, your choice:

Hmmn, tough one between Genesis on the Selling England tour or the Floyd Animals tour (with the ability to speak with Waters and convince him that it would be a good idea to record a few shows onto multitrack tapes, just in case).

 

I would be scared of the butterfly effect, so it would be something simple like going to one of the last Holly/Valens/Bopper shows.
It would also be fun to be standing next to the other guy in the distance on the Abbey Road album cover just so I could ramble about being on it.

 

If I had the chance to do this I wouldn't go to a show. I'd choose Berlin in 1928.

 

Can't change the past so if you could go back, history would record that you had always been there. So, if you see yourself at some historical event ... Better start inventing.