Musically, "A Hard Day's Night" eschews the rock and roll cover songs of the band's previous albums for a predominantly pop sound. Sputnikmusic's Dave Donnelly observes "short, peppy" pop songs characterised by layered vocals, immediate choruses, and understated instrumentation. According to Pitchfork's Tom Ewing, the lack of rock and roll covers allows listeners to "take the group's new sound purely on its own modernist terms", with audacious "chord choices", powerful harmonies, "gleaming" guitar, and "Northern" harmonica. Music journalist Robert Christgau writes that Lennon–McCartney's songs were "more sophisticated musically" than before. It also features lead guitarist George Harrison playing a Rickenbacker 12-string electric guitar, a sound that was influential on the Byrds and other bands in the folk rock explosion of 1965.