Outlaw Blues(1977)

His song is a runaway hit while he's a hit runaway.

An aspiring musician is released from prison to find that a song he had written while locked up has been stolen and made into a hit record by a country music superstar. When his confrontation with the star takes a violent turn the ex-con has to go back on the run, but he finds an unexpected ally in a shrewd background singer with a plan to turn the tables in his favor.