The fourth season of Degrassi: The Next Generation commenced airing in Canada on 7 September 2004, concluded on 14 February 2005 and contains twenty-two episodes. Degrassi: The Next Generation is a Canadian serial teen drama television series. It continues to depict the lives of a group of high school sophomores and juniors as they deal with the some of the challenges and issues teenagers face such as homophobia, family issues, bullying, school shootings, mental illness, disabilities, inappropriate relationships, and sexually transmitted diseases. Every episode is titled after a song from the 1980s, except for the two-part season finale "Going Down the Road", which took its name from the 1970 Canadian film Goin' Down the Road. Filming took place between April and October 2004. The first six episodes of season four aired Tuesdays at 8:00 p.m. and 8:30 p.m. on CTV, a Canadian terrestrial television network, before settling into its regular 8:30 p.m. timeslot. When the season returned to the schedules in January 2005 following a break over the Christmas period, it aired on Mondays at 8:30 p.m. In the United States, it was broadcast on The N, a digital cable network aimed at teenagers and young adults. The season was released on DVD as a four disc boxed set on 28 November 2006 by Alliance Atlantis Home Entertainment in Canada, and by FUNimation Entertainment in the US on 24 October 2006. The last three episodes were also sold in the US, packaged together in two different releases; one version was dubbed "unrated, uncensored and uncut" and featured an audio commentary and other bonus material, the other version was dubbed "rated", and did not feature the audio commentary. Registered users of the Canadian and US iTunes Stores are also able purchase and download the season for playback on home computers and certain iPods. This was the first season to release a soundtrack, Songs from Degrassi: The Next Generation was available as a digital download on 1 November 2005.