Unrelated anecdote:
Years ago I had a cheap Blackberry lookalike phone. It had a button lock feature to prevent butt dialing, but some bright spark decided that the lock wouldn't apply to the '9' and '1' keys, presumably so that a user could dial 9-1-1 even if too panicked to unlock the keypad. Which just meant that it was really easy to butt dial 9-1-1...
Realistically, that would get annoying pretty fast and I'd soon learn to hate any song I chose. So I'd pick 4′33″, which is four minutes and 33 seconds of silence.
But otherwise I'd pick "One Bad Tank", from the video game Left4Dead2. It's the song that plays when the boss enemy enters a particular map.