There are two interludes or soundtracks that appeared in this episode:

Nine Inch Nails "Every Day is Exactly the Same" (NOTES: The music heard in this episode)

Alabama "The night we nearly got busted"

For pure background music, it is Nine Inch Nails "Every Day is Exactly the Same". Just go to Baidu MP3 and search for the song title. Find the genuine music link.

Hope this helps:)