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From Wikipedia:
Pena's debut album was the self-titled Paul Pena, released in 1972 to critical acclaim but little commercial success. His second and final album, New Train, was recorded in 1973 but did not see release until 2000, owing to creative and business disputes with Albert Grossman, head of Bearsville Records, who considered the record unmarketable. "Paul was devastated," said Gunther Weil, his manager. "It was essentially the end of Paul's career."[4]Steve Miller heard the unreleased album and covered "Jet Airliner" on his 1977 album Book of Dreams. The song was a top 10 hit, and the royalties earned from this cover version helped support Pena for the rest of his life.[1]