Glen Campbell's iconic 1975 album Rhinestone Cowboy was a career-changing project for the superstar, and now it's been given the deluxe treatment for a new 40th anniversary re-release.

Campbell was already well-known in both country and pop music circles prior to the album's release, having carved out a career as one of the top session musicians in Los Angeles in the latter part of the 1960s as a guitarist and singer. After a brief stint in the Beach Boys, he scored a solo deal that led to timeless hits like "Gentle on My Mind," "By the Time I Get to Phoenix" and "Wichita Lineman."

But the success of Rhinestone Cowboy catapulted Campbell into mainstream superstardom, with the title song reaching No. 1 in the country, pop and adult contemporary charts. Written by Larry Weiss, the song was nominated for two Grammy awards and took some Single of the Year honors at the ACM Awards. Campbell also won big at the People’s Choice Awards for Favorite Pop/Rock Single, Favorite Country Single and Favorite Country Album.

The project scored another career single for Campbell with “Country Boy (You Got Your Feet in L.A.)." Capitol Nashville/UMe released the expanded 40th anniversary of the album on March 31, just before Campbell's 79th birthday, which is April 22.

The collection features five bonus tracks, including a previously unreleased song, “Quits,” that Campbell recorded in March 1975 during the album’s studio sessions; the North American CD and digital release debut of “Record Collector’s Dream,' which was the B-side of the “Country Boy (You Got Your Feet in LA)” single, and the worldwide CD and digital debut of “Coming Home," previously released only in Japan as a 1975 single. The album also includes remixes of “Country Boy (You Got Your Feet in L.A.)” and “Rhinestone Cowboy," which were both previously released on Campbell’s Greatest Hits collection.

The new commemorative edition of Rhinestone Cowboy is currently available as a CD or through digital audio. The remastered original album is also available on vinyl.

Check out the classic title track in the video above, which features scenes from some of the most iconic westerns of all time, including Campbell's screen debut, True Grit, which paired him with the legendary John Wayne.

See Yearbook Photos From Glen Campbell + More