Heavy metal music styles in its early years, but by 1969 vocalist Ian Gillan and guitarist Ritchie Blackmore had led the band toward the developing heavy metal style. In 1970, Black Sabbath and Deep Purple scored major UK chart hits with "Paranoid" and "Black Night", respectively. That same year, two other British bands released debut albums in a heavy metal mode: Uriah Heep with "...Very 'Eavy ...Very 'Umble" and UFO with "UFO 1". Bloodrock released their self-titled debut album, containing a collection of heavy guitar riffs, gruff style vocals and sadistic and macabre lyrics. The influential Budgie brought the new metal sound into
Heavy metal bass who played Hammond organ on some songs or the bassists from mainstream metal bands such as Styx and the Scorpions who use a pedal keyboard, which is played with the feet. Professional metal bassists may have a bass technician who tunes their basses before and during a performance, sets up the speaker cabinets, amplifiers and effects units, and performs routine maintenance on the instruments and equipment (e.g., changing strings, replacing speakers, replacing amplifier tubes, etc.). In relation to the gender composition of heavy metal bands, it has been said that "[h]eavy metal performers are almost exclusively male" "... [a]t least