Heavy metal music
Critics disagree over who can be thought of as the first heavy metal band. Most credit either Led Zeppelin or Black Sabbath, with American commentators tending to favour Led Zeppelin and British commentators tending to favour Black Sabbath, though many give equal credit to both. A few commentators—mainly American—argue for other groups including Iron Butterfly, Steppenwolf or Blue Cheer. Deep Purple, the third band in what is sometimes considered the "unholy trinity" of heavy metal (Black Sabbath, Led Zeppelin, and Deep Purple), despite being slightly older than Black Sabbath and Led Zeppelin, fluctuated between many rock styles until late 1969 when they took a heavy metal direction.
Australian heavy metal
AC/DC is often cited as being Australia's foremost hard rock band. AC/DC's influence on metal is quite clear however, with a style built around a predominately loud, heavy riffing guitar sound. With regard to heavy metal, Sydney band Buffalo could well be considered one of the country's first exponents of the style. Originally formed under the name Head in 1967, Buffalo began playing a very similar style to that of Black Sabbath from 1970. The band was the first non-British act to be signed to Vertigo and released three albums with them between 1972 and 1975 but never found mainstream success in Australia. The group's bass guitarist Peter Wells formed Rose Tattoo in 1976, another band often cited as laying a cornerstone for Australian metal. Like Buffalo, Rose Tattoo's music was ignored by Australian radio while building a strong cult following internationally. Conversely, The Angels always courted commercial success in Australia while finding progress tougher overseas. The Angels were probably closer to metal than Rose Tattoo, with the albums "Night Attack", "Watch The Red" and "Two Minute Warning" harbouring a distinctly heavy metal sound, yet while all three charted highly ("Two Minute Warning" peaked at No. 2), none of their singles reached higher than No. 21 ("Stand Up", 1982). The Angels were rarely referred to as a heavy metal band in Australia however, and in the modern context would possibly not now be considered one.
Without support from radio airplay even well-established foreign metal bands found little success on the Australian singles charts until the last half of the 1980s. Albums, significantly those of Iron Maiden, occasionally charted highly however, and Iron Maiden and Twisted Sister were two of the few foreign metal bands to conduct Australian tours in the first half of that decade. In spite of this, metal music had a large underground following, with small independent retailers like Sydney's Utopia Import Records catering for the audience. Utopia was established in 1978 by record collector John Cotter who began trading metal and punk albums that were generally not given release in Australia and by the early 1980s was the country's best known retailer of heavy metal music.