"Mr Crowley" is a 1980 heavy metal song performed by Ozzy Osbourne, released on the album Blizzard of Ozz, Osbourne's first solo effort following his firing from Black Sabbath. It peaked at number 46 on the United Kingdom charts. Musicians playing on the song are guitarist Randy Rhoads, bass guitarist Bob Daisley, and drummer Lee Kerslake. Don Airey plays the song's distinctive organ introduction. In more recent Deep Purple shows, Airey will incorporate the song's intro into his keyboard solo spot.

The song is one of two singles ("Crazy Train" being the other) released from the Blizzard of Ozz album. (1980)

The second guitar solo in "Mr Crowley", played by Rhoads, is ranked number 28 on Guitar World Magazine's poll of the "100 greatest guitar solos" and number 34 on Planet Rock's list of the 50 greatest guitar solos.

The song was inspired by books about Aleister Crowley which Ozzy Osbourne had read and a deck of tarot cards that were found in the studio. Aleister Crowley was an English Occultist and mountaineer who had links to many cults, setting up the Thelemite religion. In the song he is asked whether he "talked to the dead"

Mister, usually written in its abbreviated form Mr or Mr. (American English), is a commonly used English honorific for men under the rank of knighthood. The title derived from master, as the equivalent female titles, Mrs., Miss, and Ms, all derived from the archaic mistress. The title master was retained and used for boys and young men, but is now less commonly used. The plural form is Misters, or the abbreviation Messrs (UK) or Messrs. (US) ( /ˈmɛsərz/). This is an English abbreviation of the French "messieurs" (French pronunciation: [mesjø]), sometimes pronounced /ˈmɛsərz/ in English.

When addressing someone directly: Mr. is usually used with the last name only ("May I help you, Mr. Thompson?"). In other circumstances, it can be used with either the last name or the full name ("This is Mr. John Smith."; "Would you please help, Mr Smith?"). In formal written address, it is usually used along with the full name, or with initials and surname.

When a man's name is unknown, "mister" is sometimes used informally by itself in direct address, as in, "Hello, mister," or "Are you all right, mister?" rather than the standard form of address, "Sir". Though not necessarily meant disrespectfully, such use may to some people seem rude.

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.

Randall William Rhoads (December 6, 1956 – March 19, 1982) was an American heavy metal guitarist who played with Ozzy Osbourne and Quiet Riot. A devoted student of classical guitar, Rhoads combined his classical music influences with his own heavy metal style. Despite his short career, Rhoads is a major influence on neo-classical metal, and is cited as an influence by many guitarists and is included in several "Greatest Guitarist" lists.

At age 14, Rhoads formed a cover band called Violet Fox (after his mother's middle name, Violet), with his older brother Kelle on drums. Violet Fox staged several performances in the "Grand Salon" at Musonia, Delores Rhoads' music school. Among their setlist was "Mississippi Queen" by Mountain, and songs from The Rolling Stones, Alice Cooper and David Bowie. After the dissolution of Violet Fox, Rhoads taught his best friend Kelly Garni how to play bass, and together they formed a band called The Whore (rehearsing during the day at Rodney Bingenheimer's English Disco, a 1970s Hollywood nightspot), spending several months playing at backyard parties around Los Angeles.

Paul Bruce Dickinson (born 7 August 1958) is an English singer, songwriter, airline pilot, fencer, broadcaster, author, screenwriter, actor and former marketing director, best known as the lead vocalist of the heavy metal band Iron Maiden.

Dickinson began his career in music fronting small pub bands at school and University, including Styx (not the American band of the same name) in 1976, Speed, (1977–1978), and Shots in early 1979. He then joined the band Samson later in 1979, where he gained some popularity under the stage name, "Bruce Bruce." He left Samson in 1981 to join Iron Maiden as their new vocalist, replacing Paul Di'Anno, and debuting on their 1982 album The Number of the Beast. During his first tenure in the band, they issued a series of high impact releases, resulting in Dickinson gaining worldwide fame, and becoming one of the most acclaimed heavy metal vocalists of all time.

Dickinson quit Iron Maiden in 1993 in order to pursue his solo career, being replaced by Blaze Bayley, which saw him experiment with a wide variety of heavy metal and rock styles. Dickinson rejoined the band in 1999 along with guitarist Adrian Smith, with whom he released four subsequent studio albums. Since his return to Iron Maiden, Dickinson issued one further solo record in 2005, Tyranny of Souls. He is the older cousin of Rob Dickinson, former lead singer of British alternative rock band Catherine Wheel. His son, Austin, is the lead singer in metalcore band Rise to Remain. On 19 July 2011, Dickinson was presented with an honorary music doctorate from Queen Mary College, in honour of his contribution to the music industry.