45RPM - Past Luv: http://www.sendspace.com/file/ou1bst
Bae Chi Gi - Unfade: http://www.sendspace.com/file/rksnxs
Mc Mong- Because I'm A Guy: http://www.sendspace.com/file/754m60

Credit: sugarroll@crunchyroll

or

01 Mc Mong - Because I'm a Man (main hip-hop theme)
02 Tree Bycicle - Earth, Wind, Tears (lyric song of the final battle)
03 45 rpm - Past Luv
04 Baechigi - Unfade (track at the library)

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credit: gianni777