John Mayer Previews Grateful Dead's 'Tennessee Jed' Ahead of Dead & Company Tour: Watch

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John Mayer performs during the 2013 New Orleans Jazz & Heritage Music Festival at Fair Grounds Race Course on April 26, 2013 in New Orleans.

Dead & Company -- three quarters of the core Grateful Dead members plus John Mayer -- is hitting the road in about a month and they're getting ready. 

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Mayer posted a video to Instagram Tuesday night teasing a 15-second clip of the Dead's "Tennessee Jed," where he's clearly enjoying himself ripping on his new PRS custom guitar.   

He also wrote that rehearsals have now begun for the shows, adding, "This is some magical stuff we have going. Can't wait to take it on the road."

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Dead & Company features Dead members guitarist Bob Weir and drummers Mickey Hart and Bill Kreutzmann, as well as Oteil Burbridge of the Allman Brothers and Aquarium Rescue Unit on bass and Ratdog keyboardist Jeff Chimenti, who played all five Fare Thee Well shows alongside Bruce Hornsby.

The tour starts Oct. 28 at Times Union Center in Albany, NY.