Here you'll find many recordings—some even with precreated sections!—that you can use so you don't have to find your own. To request that songs be added to the library, send me a message on GitHub.
If you're wondering how to transcribe, JazzAdvice.com is an excellent resource. This post, for example, has a wealth of information and links to many others.
Recordings (organized by leader):
Song files from YouTube. No copyright is claimed over any of the above songs. Their use is intended for education only. I will modify or remove songs at the request of their copyright holder.