Ozzy Osbourne sings Bob Dylan

Ozzy Osbourne makes a guest appearance on a new version of the Bob Dylan classic "Masters of War," according to Blabbermouth. The song serves as the title track for a collection of Dylan covers rearranged and recorded by frontman Leslie West and drummer Corky Laing of the classic rock band Mountain. The CD, which is due out on Tuesday (July 24th), also features contributions from Allman Brothers Band guitarist Warren Haynes and others.

Osbourne and West have known each other for more than 35 years. Osbourne's first band, Black Sabbath, did its debut U.S. tour as Mountain's opening act.

The singer recorded Mountain's "Mississippi Queen" for his Prince of Darkness box set in 2005.

Osbourne is currently headlining this summer's free edition of Ozzfest, which stops in Phoenix, Arizona on Tuesday (July 24th).

A report in the San Jose Mercury News last Thursday (July 19th) indicated that about half of the fans who had received free tickets to the festival through its sponsors' web sites actually showed up for its Sacramento, California date on the 17th. Fans who came to the Mountain View, California date on the 19th without tickets were let in anyway until the venue's capacity was reached.