Uriah Heep are an English rock band formed in London in 1969 and regarded as one of the seminal hard rock acts of the early 1970s who heralded the progressive rock movement of the decade. Uriah Heep's progressive/art rock/heavy metal fusion's distinctive features have always included a massive keyboard sound, strong vocal harmonies and (in the early years) David Byron's quasi-operatic vocals. Twelve of the band's albums have made it to the UK Albums Chart (Return to Fantasy reached No. 7 in 1975) while of the fifteen Billboard 200 Uriah Heep albums Demons and Wizards was the most successful (#23, 1972). In the late 1970s the band had massive success in Germany, where the "Lady in Black" single was a big hit. Along with Led Zeppelin, Black Sabbath and Deep Purple, Uriah Heep had become one of the top bands in the early 1970s - one of "The Big 4" of hard rock.