Ozzfest is an annual festival tour of the United States (and in some years, Europe) featuring performances by many heavy metal and hard rock musical groups. It was founded by Ozzy Osbourne and his wife Sharon Osbourne, both of whom also organize each yearly tour with their son Jack Osbourne. The Ozzfest tour has featured bands of a variety of genres within heavy metal and hard rock, including alternative metal, thrash metal, industrial metal, metalcore, hardcore punk, deathcore, nu metal, death metal, post-hardcore, gothic metal and black metal. Ozzy Osbourne and Black Sabbath have played the tour several times over the years.

The festival was created in 1996 by Ozzy Osbourne's wife and manager, Sharon Osbourne, when organizers of musical festival Lollapalooza refused to let Ozzy Osbourne join the tour. The tour was well-received, which prompted the festival to become a yearly occurrence.

The first Ozzfest was not a national tour, but rather a two-day festival held in Phoenix, Arizona and Devore, California on October 25 and 26th, 1996 respectively.

John Michael "Ozzy" Osbourne (born 3 December 1948) is an English heavy metal vocalist and songwriter, whose musical career has spanned over 40 years. Osbourne rose to prominence as lead singer of the pioneering English band Black Sabbath, whose dark and hard sound helped spawn the heavy metal genre. Due to Sabbath's dark style, Osbourne became known as the "Prince of Darkness". Osbourne is also known as the "Godfather of Heavy Metal".

In the early 2000s, Osbourne's career expanded when he became a star in his own reality show The Osbournes, alongside wife/manager Sharon and two of their three children, Kelly and Jack. A documentary about his life and career, God Bless Ozzy Osbourne, premiered in April 2011 at the Tribeca Film Festival and was released on DVD in November 2011. Osbourne has achieved multi-platinum status as a solo artist and with Black Sabbath and has sold over 100 million albums worldwide.

John Michael "Ozzy" Osbourne was born in Aston, Birmingham, England, on 3 December 1948. His father Jack worked shifts as a toolmaker at GEC. His mother Lillian worked for the car components firm Lucas. John was the fourth of six children. Ozzy had two brothers (Paul and Tony) and three sisters (Jean, Iris and Gillian); they lived in a small two bedroom home at 14 Lodge Road in Aston. The nickname "Ozzy" was first used when he was in primary school. Although called "John" by his first wife Thelma, Osbourne states that it has been a long time since he's recognised himself when called by his formal name.

Dimmu Borgir ( /ˌdɪmuː ˈbɔrɡɪər/) is a Norwegian black metal band from Oslo, Norway, formed in 1993. Dimmu Borgir means "dark cities" or "dark castles/fortresses" in Icelandic, Faroese and Old Norse. The name is derived from a volcanic formation in Iceland, Dimmuborgir. The band has been through numerous line-up changes over the years; guitarist Silenoz and vocalist Shagrath are the only founding members remaining.

Dimmu Borgir was founded in 1993 by Shagrath, Silenoz, and Tjodalv, the band released an EP in 1993 entitled Inn i evighetens mørke ("Into the Darkness of Eternity" in English). This short EP sold out within weeks, and the band followed up with the 1994 full length album For All Tid ('For All Time' in English) This album featured vocal contributions by Vicotnik of Ved Buens Ende and Dødheimsgard and Aldrahn of Dødheimsgard and Zyklon-B. The initial lineup consisted of Shagrath playing drums with Tjodalv on guitar and Silenoz contributing lead vocals. This line-up changed before the release of Stormblåst (translates to "Storm Blown") on Cacophonous Records in 1996, an album considered by many to be their finest. It is also the last album which features all lyrics written and sung in Norwegian. This album was criticized by Allmusic because of bad sound quality and inaccessibility to wide audience.