My favorite concert I've been able to attend so far was Allison Krauss and Union Station, featuring Jerry Douglas.

Little did I know that the 'featuring' part meant that while A.K. and U.S. took a mid-show break, Jerry Douglas would put on a psychadelic guitar-hero instrumental rock show using electrified dobro for over 1/2 hour. I'm pretty sure Jerry Douglas could play any instrument he set his mind to with aplomb.

In addition to ridiculous instrumentalist talent featured throughout the entire show, it was the best engineered live show I've ever attended from a sound quality standpoint.