According to TV.com , the music in that ep is "Angel" by Massive Attack. ( Lyrics Video ) Is that the one you meant?

According to Wiki , it's been in a couple of movies. Maybe that's where you've heard it?

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One is the track Angel, which is included in the movies Pi[9], Snatch, Antitrust and Flight of the Phoenix. In the film Go, Angel is played at high volume by the drug dealer Todd as he searches Ronna for a hidden microphone, but the song is not included in the soundtrack.
In any case, speaking of massive attacks... A grocer's apostrophe? From the EIC? thud

(Sorry. I shouldn't nitpick in public, but it just jumped out at me...)

When in doubt, think about penguins. It probably won't help, but at least it'll be fun.