Languages you don't speak also work.
Along the the same lines as fumar's suggestions, I recommend:
1. Music from Braid (yes, the video game)
2. Black Swan (Original Motion Picture Soundtrack)
3. The Social Network Soundtrack
http://open.spotify.com/user/ryan.aidan/playlist/5ot3B9EqCZF...
Shameless plug. I released an EP recently. I will be honest only two tracks are, what I consider, finished work. Track 2 and 5. But, still learning... fantasmafigueroa.bandcamp.com
This agrees with generally accepted psychological models. The mind is totally single-threaded in language processing/parsing (compared to incredible parallelism in spatial processing).
Instrumental/lack of vocals also helps me. I mostly listen to post rock - godspeed you!black emperor, pelican, mogwai.
Electronic
1. Glenn Underground - Atmosfear (house)
2. Aphex Twin - Ambient Works 85-92
3. Moby - 18
4. Space Dimension Controller - The Pathway To Tiraquon6 (soul-house)
5. Boards of Canada - Music has the right to Children
6. Ulrich Schnauss - Far Away Trains Passing By
Post-Classical
1. Steve Reich - Music for 18 Musicians
2. Ólafur Arnalds - ...And They Have Escaped the Weight of Darkness
3. Max Richter - Memoryhouse
4. Nico Muhly - Speaks Volumes
Pop/Indie/Jazz
1. Royksopp - Melody AM
2. The Album Leaf - In a Safe Place
3. Sigur Ros - Agaetis Byrjun
4. Miles Davis - In a Silent Way
5. Benoit Pioulard - Lasted