This has been discussed many times before. pg should really include a search bar or link on this site...
1) go to Google
2) in the search bar type:
<your search terms here> site:ycombinator.com
For example:
http://www.google.com/search?q=music+hacking+site%3Aycombina...
my preferred way, but fails on posts where points < 2 because of rel="nofollow".
Synthetic folk, great trance-type music when you get in the zone.