Sumner and Hook formed the band after attending a Sex Pistols concert. While Joy Division's first recordings were heavily influenced by early punk, they soon developed a sound and style that made them one of the pioneers of the post-punk movement. Their self-released 1978 debut EP "An Ideal for Living" drew the attention of the Manchester television personality Tony Wilson, who signed them to his independent label Factory Records. Their debut album "Unknown Pleasures", recorded with producer Martin Hannett, was released in 1979.