i have slayer's "here comes the pain" set for one of my friends i don't really like, lol. to be honest i wouldn't bother with songs, if random people hear it they're gonna judge you for it WHATEVER it is. at the very least 'ffs can't i enjoy my train journey in peace, what an inconsiderate ' or something...
It makes me seem superior when i have the standard ringing tone. I shake my head solemnly at those who need to be reminded of a track they like every time their phone rings.