Can you suggest a single for me to download?

I just received Amazon credit good for exactly one MP3 download. I’m already foreseeing “iTunes-itis,” which is indecision before a choice of too much music. I’m looking for something that will get me interested in a group I’ve never gotten into before. The kinds of music I listen to most often are various kinds of electronica and rock, but I also like jazz, blues, reggae/dancehall, some hip-hop, and ‘world music.’

Can you suggest a single (new or old) and tell me why you like it? Thank you.