To celebrate the release of Gov't Mule's new album 'Shout!,' Ultimate Classic Rock is teaming up with Diffuser.fm to give away a signed Warren Haynes signature model Washburn acoustic guitar.

Released in February 2013, the WSD5240 Warren Haynes guitar is based on the design of the original 1937 Washburn Solo Deluxe, complete with a tobacco sunburst body, Grover Butterbean tuners and vintage-styled inlays in the headstock, back and rosette. It features a solid spruce top with a mahogany neck and rosewood sides and back.

The guitar we are giving away, which retails for $599, will be used -- and then autographed -- by Haynes at a solo session scheduled to take place at the Ultimate Classic Rock studios on Sept. 25.

'Shout!' is a two-disc set in which the second disc contains guest vocalists lending their talents to the same songs found on the first disc. Among the stars who sit in are Elvis Costello, Steve Winwood and Dr. John.

For your chance to win a copy of the set, follow the instructions on the widget above. Sharing your entry across Facebook and Twitter platforms will give you more opportunities to win. The contest will expire on Oct. 21, 2013, at 11:59PM EDT. Be sure to read our official contest rules, and good luck!