Everybody gets sidetracked myself included, but there are certain machines you just don't want to hear while waiting for your buddy to take a leak or talk to his mom on the phone.
EMs and some early solid states are pretty forgiving in this department, but I remember playing Metallica and it was still stuck in a Seek And Destroy loop when I woke up in the chair the next morning. Theatre of Magic was another hurry up and get it over with.
Then there are some that play their between ball bullshit and it never gets old. Those are the keepers.