In 1990, Brian Eno and John Cale made a wonderful experimental pop/art rock record called Wrong Way Up, released by Warner Bros. Records. At the time, the label would send out 7" records to alt.rock/college radio stations to promote their new releases. The promo series, called Soil Samples, featured different artists on each side of the record performing songs that weren't included on their new albums.
Above is Brian Eno's contribution to Soil Samples #3, a sublime cover of Johnny Cash's "Ring of Fire," originally written by June Carter and Merle Kilgore.