Heavy metal is the music critics love to hate, but also the longest lasting mainstay of rock music. More than any other band at the time, Black Sabbath were influenced by their surroundings, heavily industrialised Birmingham. This was even more true for guitarist Tony Iommi, who cut off the tips of two fingers in a steel factory. When he tried to solve this problem by melting a washing up liquid bottle, and forming two 'thimbles' for his fingers, he found that by tuning his guitar down three semitones (to C#), he could play just as easily, and also get a very different, altogether much darker sound (although this was not used until their third album). Another inspiration for the band came from the movie theatre across the street. Sabbath decided that if people were eager to pay money to be scared, then maybe they should play scary music.