A Perfect Circle is an American rock supergroup formed in 1999 by guitarist Billy Howerdel and Tool vocalist Maynard James Keenan.
 A Perfect Circle has released three albums: their debut "Mer de Noms" in 2000, a follow up, "Thirteenth Step" in 2003, and an album of radically re-worked cover songs titled "Emotive" in 2004.
 Shortly after "Emotive"' s release, the band went into hiatus while Keenan returned to Tool and starting up solo work in the form of the band Puscifer, and Howerdel releasing a solo album, "Keep Telling Myself It's Alright", under the moniker Ashes Divide.
 Band activity was sporadic in the coming years; the band reformed in 2010, and played live shows on and off between 2010 and 2013, but fell into inactivity after the release of their greatest hits album, "Three Sixty", and a live album box set, "" in late 2013.
 However, in 2017, the band returned to touring and announced plans to record and release a fourth studio album under a new record label, BMG Rights Management, between late 2017 and early 2018.
Keep Telling Myself It's Alright is the debut studio album by American rock band Ashes Divide, the solo-project by A Perfect Circle guitarist Billy Howerdel.
 While efforts towards a Howerdel solo album were started even back in his time in A Perfect Circle during touring in support of their 2003 album "Thirteenth Step", commitments to A Perfect Circle and other projects, along with some difficult recording sessions, pushed the album's release out to April 8, 2008.
 Its first single, "The Stone," entered radio circulation in January of that year.
Maynard James Keenan (born James Herbert Keenan; April 17, 1964), often referred to by his initials MJK, is an American singer, songwriter, musician, record producer, actor, and winemaker.
 He is best known as the vocalist for the alternative rock bands Tool, A Perfect Circle, and Puscifer.
Sweethead is an American alternative rock group formed in 2008.
 The group's lineup consists of singer Serrina Sims and guitarist/multi-instrumentalist Troy Van Leeuwen (of Queens of the Stone Age, formerly of A Perfect Circle, Enemy and Failure).
 For recording and touring they are joined by a variety of guest musicians, many of which are current or former members of Queens of the Stone Age or Mark Lanegan Band.
The discography of American alternative rock supergroup A Perfect Circle consists of three studio albums, two compilation albums, one extended play, one video album, nine singles, one promotional single and ten music videos.
 A Perfect Circle is the brainchild of Billy Howerdel.
 After hearing demos of Howerdel's music, Maynard James Keenan, the lead singer of Tool, offered his services as vocalist.
 Howerdel agreed, and the band formed in 1999.
 They were then joined by bassist/violinist Paz Lenchantin, guitarist Troy Van Leeuwen, formerly of Failure, and drummer Tim Alexander, formerly of Primus.
 Soon after entering the studio to record their first album, Alexander was replaced by Josh Freese of The Vandals. "
Mer de Noms" was released in May 2000, selling 188,000 copies its debut week.
 The band embarked on a number of headlining tours all over the world to promote the album which was certified gold by the Recording Industry Association of America (RIAA) one month after its release, and platinum just four months later.
Ana Lenchantin is an Argentine-American cellist (of French ancestry) known for frequent appearances with American rock bands such as Train, Into the Presence, The Eels, Gnarls Barkley, No Doubt, Arthur Lee and Love, A Perfect Circle, Nine Inch Nails, Queens of the Stone Age, Thirty Seconds to Mars, Brian Wilson, Billy Corgan, Billy Howerdel, Glenn Hughes, Jenny Lewis, Melissa Auf der Maur, Damien Rice, Kerli, Lenka, and many more.
A Perfect Circle Live: Featuring Stone and Echo is a live box set by American rock supergroup, A Perfect Circle.
 It was released via the band's own label, A Perfect Circle Entertainment, on November 26, 2013, a week after the release of the band's greatest hits album, "Three Sixty".
Ashes Divide is the name used for the solo project of American rock musician Billy Howerdel, guitarist of the alternative rock band A Perfect Circle, where he is the primary songwriter, musician, producer, and vocalist.
 The project's debut album, "Keep Telling Myself It's Alright", was released in 2008.
 Howerdel formed a live band and toured in support of the album through the rest of the year, but the project fell to the wayside after A Perfect Circle reformed and toured in 2010 and 2011.
 Howerdel would work on both projects for a while until late 2012, where he announced his primary focus is completing the second album, of which he hoped to enter the mixing phase in January or February 2013.
Billy Howerdel (born May 18, 1970) is the founding member, guitarist, songwriter, and producer for the bands A Perfect Circle and Ashes Divide.
 He has recorded three acclaimed studio albums with the former, and in 2008, Ashes Divide released their debut album, "Keep Telling Myself It's Alright".
Extasick is a Digital Hardcore band from Tours, France.
 the group is now initially led by Lead guitarist/vocalist/programmer Lewsor, but the original line up featured guitarist/programmer/additional vocalist Barmy Failure.
 The group released their debut "...And This Dirty Musick" on Canadian DHR based label D-Trash Records, and the album received a good review from Kerrang!
 and Terrorizor Magazine.
 Shortly after this release Barmy Failure left.
 The band is currently on hiatus while Lewsor concentrates on trying to make music for his upcoming album 'No Error Its Lewsor', and hopefully finds another musician to join Extasick.
 More recently, a two newer tune has appeared called Impratical Minefields and a cover of Atari Teenage Riot's song No Remorse on the group's myspace and a new album entitled Overdose may be released sometime in the near future.

Question: The rock group A Perfect Circle was founded by Billy Howerdel and another musician who was born in what year?
Answer: 1964