Canadian musician Neil Young has filed for divorce from his wife, Pegi Young, after 36 years of marriage.

Neil Young, 68, submitted a dissolution of marriage petition in San Mateo, Calif. on July 29. A hearing is scheduled for Dec. 12.

Pegi was the inspiration for a number of Young's love songs, including "Unknown Legend" from his 1992 album "Harvest Moon." He met Pegi while she was working at a California diner in 1974, and the two were married four years later.

"Unknown Legend" describes their courtship at the diner, where Young used to order food just for an opportunity to speak to Pegi.

Pegi joined Young on stage in the early 1990s as a backup singer, and eventually transitioned to her own solo music career. She's released three albums of her own since 2007, and has tour extensively. Neil Young has occasionally served as her guitar player.

They have two children, a daughter and a son with cerebral palsy. Motivated by their son's condition, the couple founded The Bridge School in 1986 to help educate children with severe physical disabilities. Neil and Pegi Young hold a benefit concert every year for the school, with the next one scheduled for Oct. 25-26 in California.

Their last on-stage performance together was at the 2013 Bridge School benefit, according to Rolling Stone.

Neil Young continues to actively tour and promote environmental causes. His next scheduled performance is Sep. 13 at Farm Aid in Raleigh, North Carolina. His next Canadian gig will be in Vancouver, B.C. on Nov. 9.

His latest album was "A Letter Home," released on April 19, 2014. Guitarist Jack White also performs on the album.

Young is expected to release his latest memoir in October, titled "Special Deluxe: A Memoir of Life and Cars."