The 1955 song that was Elvis Presley’s “signature” tune, according to Scotty Moore

Guitarist Scotty Moore, who backed Elvis Presley from 1954 to 1958 as part of the Blue Moon Boys, named "Mystery Train" as his own signature performance in a 1993 interview with Vintage Guitar magazine. Moore's playing was central to Presley's early sound, influencing later guitarists such as Keith Richards and Jeff Beck, and he is credited with pioneering the power chord and a rockabilly-style finger-picking technique that shaped rock guitar for decades to come.

Moore singled out the 1955 B-side as special partly because it was the first track he recorded through his custom-built amplifier, which replicated the slapback echo effect used by Sun Studio owner Sam Phillips. Although "Mystery Train" is not among Presley's better-known hits, Moore's undulating picking style on the track is widely regarded as showcasing his guitar work at its most distinctive, at times drawing more attention than Presley's own vocal performance.