"Don't Worry" by Marty Robbins is notable for an unexpected moment of musical history: an early example of guitar distortion. During the recording, a faulty channel in the mixing desk unintentionally transformed Grady Martin's six-string bass tone into an unusual distorted sound in the bridge section and at the end. Despite the musician's dislike for it, the producer kept the track, and this effect was later reverse-engineered to create one of the first guitar pedals, the Maestro FZ-1 Fuzz-Tone. Playing this song, you're tapping into a sound that accidentally pioneered a significant development in guitar music.