Robert Plant joined Patty Griffin’s new band Crown Vic onstage Thursday night in Marfa, Texas at the El Cosmico Trans-Pecos festival. “I’d like to introduce you to my dear, dear friend, Robert Plant,” Griffin said before running through a set that included a few well-known rockers. ‘Rock ‘n’ Roll,’ ‘Misty Mountain Hop’ and ‘Black Dog’ were three of the Led Zeppelin tunes they played during the performance.

While Crown Vic’s array of electric guitars, mandolins, keyboards, an accordion, electric and acoustic bass, and drums supplied the instrumentation, Griffin and Plant took to the microphones causing and explosion of cheers.

Griffin goes out on the road with Buddy Miller later this month and the rumor is that Plant intends to stay in Texas to work with Crown Vic. So the question is: Could this possibly be Robert Plant’s new band?

Plant found enormous success when he teamed up with Allison Krauss, taking home five Grammys, including Album of the Year in 2009 for the ‘Raising Sand’ recording. So, Plant joining forces with Griffin and her Texas band has certainly set the rumor mill in motion.

Watch Robert Plant Singing 'Don't' with Crown Vic