I recently found out about a couple of great LOTRO music Wordpress sites put together by friends of the kin.
Some of you may already know about this one, but Zedrock has an exhaustive index of his concert recordings. You can look for a particular band, such as the Breakfast Club, Dulcet Tones, and the Fraggles or even an event, like Shirefest 2014 or 2015.
Gwinlynn has also started her own music blog, which includes a number of songs that she transcribed for public use. Please take a look and let her know what you think!