The Flying Burrito Brothers' The Gilded Palace of Sin (1969) contains two consecutive oddly-named tracks ("Hot Burrito #1" and "Hot Burrito #2") written by Gram Parsons and the bassist, Chris Ethridge, that were probably one of the high points of Parsons' short, great career. The two songs are different in almost every way despite the titles, and they still strike me as the kind of work that widens the conceptual possibilities of a style of music. As Dylan had done for both folk and rock, Parsons did for the combination of rock and country.

I was hoping to be able to provide links to both tunes, but it seems like full versions are not available at the moment, due to copyright issues or something. This video, apparently part of a documentary that I haven't seen yet, is the best that I can do at the moment: http://www.youtube.com/watch?v=-od3vmRaLHE, but really, the whole album is a must-listen.