Searching up Tim Hecker on Grooveshark will do the trick, trust me, but any lyric-less music that creates a "soundscape" is ideal. You'll have to adjust the volumes to something that works for you, but I basically try to create effective background-reducing noise that isn't too repetitive.
I usually have Itunes and Grooveshark open simultaneously, playing the following two things:
Itunes:
Pink noise/Brown noise, bring the volume up until it eliminates outside voices. Binaural Tones work well too. You'll have to do a bit of hunting to find the right sound, some will be too harsh on the ears. Try http://itunes.apple.com/us/album/mindwave-pro-binaural-tones... or http://itunes.apple.com/us/album/white-noise-for-sleep-singl...
Grooveshark:
Some ambient music, volume set to around 30-40% of Itunes. Something like http://grooveshark.com/#!/s/Music+For+Tundra+Part+1/2Wc6OO?s...
Searching up Tim Hecker on Grooveshark will do the trick, trust me, but any lyric-less music that creates a "soundscape" is ideal. You'll have to adjust the volumes to something that works for you, but I basically try to create effective background-reducing noise that isn't too repetitive.