You should dive into the Grateful Dead. They played music that is complex, fascinating, and exciting, but also has a great relaxed feeling that will put you at ease. They have four decades of live music to dig through with tons of gold nuggets to discover along the way, and most of the extant recordings are freely (legally) available online. If you jell with the Dead then they can be a deep well of good feelings.
You can start with their official live releases or if you want to dig deeper you can dig through audience tapes and soundboard recordings. Here is one of many good blogs to help discover and appreciate live GD:
http://www.deadlistening.com/ 
