After eight U.K. hit singles, all but two of which stormed the Top Ten, Mud had established themselves as the most successful graduates yet of the Nicky Chinn/Mike Chapman songwriting factory -- in terms of chart statistics, even the Sweet trailed in their wake. It was a major surprise, then, when it was revealed that their next single was to be an old Buddy Holly cover. Although the band had long been prone to rearranging the hits of yesteryear, they had hitherto confined their experiments to album tracks and B-sides. This was simply their most successful yet -- brilliantly built around a somber drum beat, ensemble vocals, doo-woppish harmonies, and even a spoken word section, "Oh Boy" ranks among the most skillful revisions of any Holly original.
Nevertheless, "Oh Boy" was never conceived as a single. Rather, having completed an a cappella version of the Marcels' "Blue Moon," the band decided to make a similar assault on "Oh Boy" for inclusion on their Mud Rock, Vol. 2 sophomore album. The band's decision to leave the Chinn & Chapman stable after three years, however, saw "Oh Boy" shoved onto the singles schedule as a stopgap -- and stun everyone by soaring to number one in May 1975, displacing the Bay City Rollers in the process. It remained at the top for two weeks, Mud's final chart-topper, but certainly one of their most memorable records ever.