Ronnie Dunn's participation in Sammy Hagar's upcoming album, 'Sammy Hagar and Friends,' was announced weeks ago. Now there's another country voice added to the star-studded collection. Toby Keith will also join Hagar on the CD of collaborations, performing a duet version of the Jimmy Buffett hit, 'Margaritaville.'

This isn't Hagar and Keith's first time singing together. The longtime friends have shared a stage several times in the past, including this performance of the two music icons singing Van Halen's hit song 'Finish What Ya Started' while in Cabo San Lucas. More recently, the rocker joined Keith for his Oklahoma Twister Relief Concert, which also included appearances by Garth Brooks, Trisha Yearwood, Willie Nelson and John Anderson.

Other artists appearing on Hagar's upcoming album include Kid Rock, Nancy Wilson from Heart, Red Hot Chili Peppers drummer Chad Smith and Journey guitarist Neal Schon.

'Sammy Hagar and Friends' is due in stores on September 24. The rocker plans on embarking on his solo tour, 'Four Decades of Rock,' later this month, with several guest artists joining him on the road. See all of his upcoming shows here.