Question: How many former members from the band where Zack De La Rocha was a rapper/vocalist took part in the Audioslave discography? 
Context: Lyricist Lounge, Volume One is the first installment of Rawkus Records "Lyricist Lounge" album series, based on the "Lyricist Lounge" showcases in New York City.  The double-disc compilation features De La Soul, Mos Def, Q-Tip, Tash of Tha Alkaholiks, Punch & Words, O.C., Ras Kass, Black Thought, Common, Pharoahe Monch, Saul Williams, Kool Keith, Talib Kweli & Hi-Tek, Bahamadia, Rah Digga, Shabaam Sahdeeq, Jurassic 5, KRS-One, Zack de la Rocha of Rage Against the Machine, Last Emperor and Company Flow. The discography of Rage Against the Machine, an American rap metal band, consists of four studio albums, two live albums, one compilation album, one demo album, 17 singles, four video albums and 15 music videos. Formed in Los Angeles, California in 1991 by vocalist Zack de la Rocha, guitarist Tom Morello, bassist Tim Commerford and drummer Brad Wilk, the band signed to Epic Records and released its self-titled debut album in 1992.  The album reached number 45 on the United States "Billboard" 200 and was certified three times platinum by the Recording Industry Association of America (RIAA) for sales in excess of three million units.  "Rage Against the Machine" singles "Killing in the Name", "Bullet in the Head" and "Bombtrack" charted in the United Kingdom and several other regions. 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. Gilbert "Magú" Luján (October 16, 1940 – July 24, 2011) was a well known and influential Chicano sculptor, muralist and painter.  He founded the famous Chicano collective Los Four that consisted of artists Carlos Almaraz, Beto de la Rocha (Father of former Rage Against the Machine frontman Zack de la Rocha), Frank Romero and himself.  In 1974, Judithe Hernández became the "fifth" and only female member of Los Four. "People of the Sun" is the second single by American rap metal band Rage Against the Machine for their 1996 album "Evil Empire".  The song is about the Zapatista revolution.  Lead vocalist Zack de la Rocha wrote the song after a visit to Chiapas in southern Mexico.  "People of the Sun" also has a music video.  It was nominated for a Best Hard Rock Performance Grammy in 1998, but it lost to The Smashing Pumpkins' "The End Is the Beginning Is the End". Zacharias Manuel de la Rocha (born January 12, 1970) is an American musician, poet, rapper, and activist.  He is best known as the vocalist and lyricist of rap metal band Rage Against the Machine from 1991–2000 and 2007–2011.  He left Rage Against the Machine in October 2000 and embarked on a solo career.  With former Mars Volta drummer Jon Theodore, de la Rocha also co-founded One Day as a Lion in 2008. The discography of Audioslave, an American hard rock band, consists of three studio albums, two extended plays (EPs), fourteen singles, two video albums and ten music videos. Formed in Los Angeles, California in 2001, Audioslave was a supergroup featuring former Soundgarden and Temple of the Dog vocalist Chris Cornell and three former members of Rage Against the Machine – guitarist Tom Morello, bassist Tim Commerford and drummer Brad Wilk.  Signed to Epic and Interscope Records, the band released its self-titled debut album in November 2002, which peaked at number 7 on the US "Billboard" 200.  Supported by five singles, all of which reached the top ten of the "Billboard" Mainstream Rock Songs chart, "Audioslave" was certified triple platinum by the Recording Industry Association of America (RIAA).  The band's first video album, also self-titled, was released in 2003 and reached number 5 on the "Billboard" Top Music Videos chart, receiving a gold certification from the RIAA. Rage Against the Machine is an American heavy metal band from Los Angeles, California.  Formed in 1991, the group consists of rapper and vocalist Zack de la Rocha, bassist and backing vocalist Tim Commerford, guitarist Tom Morello, and drummer Brad Wilk.  They draw inspiration from early heavy metal instrumentation, hip hop acts such as Afrika Bambaataa, Public Enemy, and the Beastie Boys, punk rock such as the Sex Pistols and Fugazi, and Dutch crossover band Urban Dance Squad.  Rage Against the Machine is well known for the members' revolutionary political views, which are expressed in many of the band's songs.  As of 2010, they had sold over 16 million records worldwide. We Want It All is one of only two songs the Rage Against the Machine vocalist Zack de la Rocha released while the band was disbanded.  Out of the twenty or so tracks which De La Rocha and Trent Reznor of Nine Inch Nails collaborated on, this is the only track of those sessions which has been released.  The song was produced by Reznor and was recorded at Nothing Studio in New Orleans in 2003.  It was mixed by David Bianco at Sunset Sound in Los Angeles and mastered by Steve Marcussen. Renegades is the fourth studio album by the American rap metal band Rage Against the Machine, released on December 5, 2000 by Epic Records.  The album consists entirely of cover songs and includes covers of artists such as Bruce Springsteen, Bob Dylan, Minor Threat, Eric B. & Rakim, EPMD, MC5, The Rolling Stones, Cypress Hill, and Devo.  It was released after Rage singer Zack de la Rocha left the band, but still featured his vocals.  After the release of "Renegades", the remaining three members of the band reformed with Chris Cornell on vocals as Audioslave.  Rage did, however, release another album, "Live at the Grand Olympic Auditorium", a live recording of their final two concerts before their initial break-up, in Los Angeles on September 12 and September 13, 2000.  The bonus live version of "Kick Out the Jams" on the European version of this album also appears on "Live at the Grand Olympic Auditorium".  Their version of "Maggie's Farm", was featured in the credits of the 2010 film "The Other Guys".  The album achieved platinum status a little over a month after its initial release.
Answer: three