The aforementioned artist did all the compositions for Durarara!! And the youtube account below has all of the tracks but one.

http://www.youtube.com/user/llShIzUoHeiWaJiMall

So if you have YoutubeDownloader, you can easily acquire them. This thread is to discuss your favorites.

For example, my favorites would be Hohoemi no Kage, Kyuujitsu no Shifuku, Their Aspirations, and The Girl In the Drawing; which all just seem to go together, by the way.