Tommy Moeller was a singer, pianist, and guitarist from Hertfordshire, England, who, in the early '60s, put together a folk group called Unit Four, one of whose other members was guitarist Brian Parker. Parker did not stay in the group long, but he and Moeller formed a songwriting partnership. By 1963, the quartet was filled out by Peter Moules as second vocalist, and Howard Lubin and David Meakle on guitars. In the wake of the Merseybeat boom, the group's manager suggested they add a rhythm section, so in came bass player Rodney Garwood and drummer Hugh Halliday, and the re-christened Unit Four Plus Two signed to Decca Records. Their first single was an adaptation of the folk song "Green Fields" that made the U.K. charts, but after their second single, "Sorrow and Pain," flopped, they took a more up-tempo approach to their next record. It was Moeller and Parker's "Concrete and Clay." With the assistance of Russ Ballard and Bob Henrit of the Roulettes, they turned the song into a sprightly, Latin-influenced tune that was irresistibly catchy from its opening percussion to its unusual vocal parts. The song concerned indestructible love in a way that recalled George Gershwin's final song, "Our Love Is Here to Stay": Once again, seemingly permanent landscapes were expected to give way before the narrator's affection would. "Concrete and Clay" became a massive British hit, topping the charts in April 1965. In the U.S. it was released on Decca's London subsidiary, quickly followed by a cover version sung by Eddie Rambeau on Dyno Voice. The two competing versions effectively canceled each other out, both making only the Top 40. (One chart that combined the two ranked "Concrete and Clay" near the Top Ten.) The song attracted a few more covers in the mid-'60s and has enjoyed the occasional one since, notably a revival by Randy Edelman that almost made the U.K. Top Ten in 1976, though it is best remembered in its original recording.