Music critics and composers John Lennon and Paul McCartney have all referred to "I'm Happy Just to Dance with You" as being "a bit of a formula song," as McCartney referred to it in his biography Paul McCartney: Many Years from Now. If that's so, let it be said that it's a formula almost any other rock band would die to master. Included in both the A Hard Day's Night album and film, it's a strikingly catchy song with the kind of chord sequences almost nobody else in popular music was doing at the time. That's particularly true of the opening instrumental bars, with its haunting shifts between three declarative guitar chords; as McCartney shamelessly admitted in his bio, "that change pretty much always excited you." This opening segment, like some other early Beatles tunes, was also unconventional for rock in starting the track with the last part of the bridge of the song, rather than going right into a verse. Looking beyond such structural musings, "I'm Happy Just to Dance with You" is an infectiously upbeat song, if an innocuous one even by early Beatles standards. Some hardened critics would later charge, to paraphrase, that the Beatles were happy just to dance with you or only wanted to hold your hand, while the Rolling Stones wanted to have rough and passionate sex. That's comparing apples and oranges, but getting back to the song at hand, the verses of the tune roll along very nicely, with the kind of choppy guitar chording the Beatles used effectively on other early songs like "All My Loving" and "This Boy." It's that minor-keyed sequence of the bridge that really sticks out, though, especially when the backup vocal harmonies really wail, pushing the melody upwards toward a particularly exultant conclusion. Those harmonies make a rather surprise appearance at the end of the last verse, where the verse and bridge almost blend as lead singer George Harrison elongates the title phrase, the song ending at the highest point of the harmonies. This was, incidentally, one of only two Lennon-McCartney songs that Harrison sang lead on (the other being "Do You Want to Know a Secret?"), and was specifically given to George to sing to make sure he had something to sing on the A Hard Day's Night album and film (in which he had no original compositions). There aren't any notable covers of the song, though fellow Brian Epstein clients the Cyrkle put it on their second album, with strange key changes and twangy sitar (or pseudo-sitar) sounds. For a good mid-'60s song clearly derived from "I'm Happy Just to Dance with You," though, check out "The Dancer," recorded by the Australian band the Allusions. And for a laugh, listen to the group's 1964 BBC recording of the song (available on various bootlegs), on which George changes the couplet "if somebody tries to take my place/let's pretend we just can't see his face" to "if somebody tries to take your place/let's pretend we just can't see his face."