Question: When does the Zack de la Rocha's friend born who is an American musician, best known as the bassist?

Context paragraphs:
Tom Morello discography: 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 Luján: 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.

Lyricist Lounge, Volume One: 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.

Tim Commerford: Timothy Robert Commerford (born February 26, 1968) is an American musician, best known as the bassist and backing vocalist for the American rap metal band Rage Against the Machine (1991–2000; 2007–2011), supergroups Audioslave (2001–2007) and Prophets of Rage (2016–present).  Since 2013 and 2015, he has also been the lead singer and bassist of the bands Future User and WAKRAT, respectively.

Zack de la Rocha: 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.

Ché Café: The Ché Café is a worker co-operative, social center, and live music venue located on the University of California San Diego campus in La Jolla, California, USA.  Zack de la Rocha described the Ché Café as "A place that is not only a great venue, but a source of inspiration and community building for any artist, student, or worker that has entered its doors."

We Want It All: 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.

Rage Against the Machine discography: 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.

Sherman Austin: Sherman Martin Austin (born April 10, 1983) is an American anarchist and musician who was arrested for inflammatory content on his website and subsequently convicted.  He was the first person to be successfully prosecuted under 18 U.S.C. 842(p), a United States federal law which makes the distribution of information on explosives unlawful if the information is provided with the knowledge or intent that the information will be used to commit a violent federal crime.  Austin was convicted under a plea agreement in 2002 and served a one-year sentence in federal prison.  Some academics and activists, including Zack de la Rocha of Rage Against the Machine, protested the prosecution of Austin.

Rage Against the Machine: 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.

Supporting paragraphs: Tom Morello discography Tim Commerford
Answer: February 26, 1968