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.
This is the discography of Tom Morello, an American Grammy-award winning rock guitarist most known for his work with the bands Rage Against the Machine, Audioslave, Street Sweeper Social Club and as his folk alter-ego The Nightwatchman.
 Morello started playing guitar in the mid 80's in the band Electric Sheep together with future Tool guitarist Adam Jones on bass.
 After graduating "" from Harvard University in 1986 with a BA in political science, he moved to Los Angeles, where he briefly worked as an aide to Senator Alan Cranston.
 Later Adam Jones moved to L.A. as well; Morello introduced Jones and Maynard James Keenan to Danny Carey, who would come to form the band Tool.
 In the late 80's Morello was recruited to replace original guitar player Mike Livingston in the rock band Lock Up, in 1986 the band released its only album Something Bitchin' This Way Comes.
 In 1991 Morello left Lock Up to start a new band, after being impressed by Zack de la Rocha freestyle rapping he invited him to join his band, he also drafted Brad Wilk who had previously auditioned as a drummer for Lock Up.
 After Zack convinced his childhood friend Tim Commerford to join as the band's bass player the line up was complete.
Tool is an American rock band from Los Angeles, California.
 Formed in 1990, the group's line-up includes drummer Danny Carey, guitarist Adam Jones, and vocalist Maynard James Keenan.
 Justin Chancellor has been the band's bassist since 1995, replacing their original bassist Paul D'Amour.
 Tool has won three Grammy Awards, performed worldwide tours, and produced albums topping the charts in several countries.
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.
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.
Conditions of My Parole is the second studio album by Puscifer.
 The album was produced by Maynard James Keenan, Mat Mitchell and Josh Eustis.
 Contributing musicians for the album include the aforementioned Keenan, Mitchell, and Eustis as well as Carina Round, Juliette Commagere, Matt McJunkins, Jeff Friedl, Gil Sharone and Rani Sharone, Jonny Polonsky, Tim Alexander, Devo Keenan, Alessandro Cortini, Tanya O'Callaghan, Sarah Jones, and Jon Theodore.
Joshua Leeds Eustis is an American musician, singer-songwriter and record producer, best known as the current sole member of electronic music act, Telefon Tel Aviv, since the death of bandmate Charles Cooper in 2009.
 He served as a touring member for industrial rock act Nine Inch Nails in 2013 and has collaborated heavily over the years with Maynard James Keenan's solo project Puscifer, for which he also served as a touring member.
 Eustis' solo project is Sons of Magdalene, of which he began releasing music under in 2008.
 He is also a founding member of the band The Black Queen.
Caduceus Cellars is a winery in Jerome, Arizona, United States.
 It is owned by Maynard James Keenan, who is best known as the vocalist for Grammy Award-winning progressive metal band Tool.
 He is descended from Northern Italian winemakers.
 While the winery is named after caduceus, an ancient symbol for commerce and staff of the Greek god Hermes, the vineyard is named Merkin Vineyards, after a pubic wig (merkin).
Tool is an American progressive metal band from Los Angeles, California.
 Formed in 1990, the band originally featured vocalist Maynard James Keenan, guitarist Adam Jones, bassist Paul D'Amour and drummer Danny Carey, although D'Amour was replaced by Justin Chancellor in 1995.
 The group released its first demo "72826" in 1991, which credited all four band members for songwriting. "
Opiate" was issued the following year, which featured re-recorded versions of "72826" tracks "Cold and Ugly", "Hush" and "Part of Me", as well as a live version of "Jerk-Off".
 The band released its debut full-length album "Undertow" in 1993, which once again credited all four band members for songwriting.
 The album also featured a contribution by former Black Flag and then-Rollins Band frontman Henry Rollins, who performed additional vocals on "Bottom".
Maynard James Keenan is best known as the lead singer of rock bands Tool, with whom he has recorded four studio albums and earned two Grammy Awards, and A Perfect Circle, with whom he has recorded three studio albums.
 Puscifer, a side project created by Keenan, has released three studio albums.

Question: Which rock band is the American musician Maynard James Keenan a vocalist for that won three Grammy Awards, performed worldwide tours, and produced albums topping the charts in several countries?
Answer: Tool