"Highway to Hell" from AC/DC is a popular choice these days, but I'd settle for one of the "Four Last Songs" from Strauss, a few bits from the Mozart "Requiem or "Goin' Back" from Dusty Springfield.
I dunno, maybe the slow movement of Rubbra's 6th symphony? But played really slowly cuz I like it when it's played really slowly which is odd because I've never heard it played really slowly but whatever.
"Time We Left" by Hawkwind, "Panama" played by the the Boll Weevil Jass Band, & Irving Berlin's "When I Leave The World Behind" played by the Savannah Jazz Band.