Mean Mr. Mustard is a track by The Beatles from the landmark 1969 album Abbey Road. The song features a distinctive, repetitive guitar riff and a whimsical, slightly menacing vocal performance by John Lennon. It serves as the opening number on the album's fictional street scene, depicting a group of eccentric characters who would otherwise be a nuisance. The recording showcases the band's experimental side during the final months of their career, blending pop sensibilities with theatrical storytelling. Its inclusion on Abbey Road highlights the group's ability to craft a complete narrative experience through their music, cementing the album's status as a masterpiece of studio production and creative direction.