Sparks enjoyed its first commercial success in the U.K. with 1974's Kimono My House, an album of neo-romanticism meets prog. rock, which reached number four in the U.K. In 1979, after a brief decline in popularity in Europe (and still little notoriety in their native U.S.), the duo called on the production talent of legendary producer Giorgio Moroder for No. 1 In Heaven, a celestial stairway of rapturous melodies heavily greased with irony and black humor, and which would later influence the synth pop of Depeche Mode and Pet Shop Boys. Though in the 1980s and beyond the Maels tended to settle for synth-driven chintz over rock 'n' roll substance, their music still retains the stinging wit that gives it savor. In 2006, the Mael brothers returned with Hello Young Lovers, an album of cheeky operatic prog. rock melodrama.