Daniel Joseph Donegan is an American musician who is the guitarist, keyboardist and one of the founding members of heavy metal band Disturbed.

The Sickness is the debut studio album by American heavy metal band Disturbed. It was released on March 7, 2000, by Giant and Reprise Records. The album peaked at number 29 on the US Billboard 200, and spent a total of 106 weeks on the chart. It was Disturbed's only album to not hit number one on the US Billboard 200 until their seventh album Evolution debuted at number 4 in 2018. In 2018, The Sickness was certified five times platinum by the RIAA for shipments of over five million copies in the US, making it the band's most successful album.