Singer-songwriter Norman Greenbaum

Published 4:52 PM ET, Mon March 30, 2015
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Norman Greenbaum plays the guitar in this undated photo from 1969. The singer-songwriter, best known for his song "Spirit in the Sky," is in critical condition after the car he was in was hit by a motorcycle on Saturday, March 28, the California Highway Patrol said. GAB Archive/Redferns/Getty Images
The album cover to Greenbaum's hit song. On his Twitter page, Greenbaum describes himself as a "one-hit wonder." 2001 Varese Sarabande Records
A photo of Greenbaum circa 1970. "Because of 'Spirit in the Sky,' I don't have to work. So in that sense, it's a comfortable living," Greenbaum told The New York Times in 2006. He said he wrote the words in 15 minutes. Michael Ochs Archives/Getty Images
With its distinctive fuzz-toned guitar, spacey effects and gospel-tinged harmonies, "Spirit in the Sky" has been featured in more than 40 movies and TV shows, including "Remember the Titans," seen here. Jerry Bruckheimer Films/Walt Disney Pictures
Celebrities such as Elton John have performed covers of "Spirit in the Sky." Ethan Miller/Getty Images
This photo is from Greenbaum's website, spiritinthesky.com. Greenbaum is now 72. From spiritinthesky.com