Westfalenhallen (Halls of Westphalia) are three multi-purpose venues, located in Dortmund, Germany. The original building was opened in 1925, but was destroyed during World War II. New halls were built, the Große Westfalenhalle opened in 1952. The capacity of the arena is 16,500. The Kleine Westfalenhalle served also for balls, exhibitions and concerts, such as the Dortmunder Philharmoniker, until the Opernhaus Dortmund was opened in 1966.

The venue played host to the 1964, 1980 and 2004 World Figure Skating Championships, as well as the 1955, 1983 and 1993 IIHF Ice Hockey World Championships tournaments.

In 1981, the venue was one of only four locations worldwide of the legendary The Wall Tour, by Pink Floyd, along with Los Angeles, Uniondale (New York) and London.

In 1983, the venue hosted the Rock Pop Festival, featuring Iron Maiden (headliner band), Scorpions, Ozzy Osbourne, Def Leppard, Quiet Riot, Judas Priest, Krokus & The Michael Schenker Group - one of the most massive heavy metal line ups of all time, featuring these bands at the peak of their careers.

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.