Background: Pearl Jam is an American rock band formed in Seattle, Washington, in 1990. Since its inception, the band's line-up has consisted of Eddie Vedder (lead vocals), Mike McCready (lead guitar), Stone Gossard (rhythm guitar) and Jeff Ament (bass). The band's fifth member is drummer Matt Cameron (also of Soundgarden), who has been with the band since 1998. Boom Gaspar (piano) has also been a session/touring member with the band since 2002.
Context: Stone Gossard and Jeff Ament were members of pioneering grunge band Green River during the mid-1980s. Green River toured and recorded to moderate success but disbanded in 1987 due to a stylistic division between the pair and bandmates Mark Arm and Steve Turner. In late 1987, Gossard and Ament began playing with Malfunkshun vocalist Andrew Wood, eventually organizing the band Mother Love Bone. In 1988 and 1989, the band recorded and toured to increasing interest and found the support of the PolyGram record label, which signed the band in early 1989. Mother Love Bone's debut album, Apple, was released in July 1990, four months after Wood died of a heroin overdose. Ament and Gossard were devastated by the death of Wood and the resulting demise of Mother Love Bone. Gossard spent his time afterwards writing material that was harder-edged than what he had been doing previously. After a few months, Gossard started practicing with fellow Seattle guitarist Mike McCready, whose band, Shadow, had broken up; McCready in turn encouraged Gossard to reconnect with Ament. After practicing for a while, the trio sent out a five-song demo tape in order to find a singer and a drummer. They gave former Red Hot Chili Peppers drummer Jack Irons the demo to see if he would be interested in joining the band and to distribute the demo to anyone he felt might fit the lead vocal position. Irons passed on the invitation but gave the demo to his basketball friend, San Diego, California singer Eddie Vedder. Vedder was the lead vocalist for a San Diego band, Bad Radio, and worked part-time at a gas station. He listened to the tape shortly before going surfing, where lyrics came to him. He then recorded the vocals to three of the songs ("Alive", "Once", and "Footsteps") in what he later described as a "mini-opera" entitled Momma-Son. Vedder sent the tape with his vocals back to the three Seattle musicians, who were impressed enough to fly Vedder up to Seattle for an audition. Within a week, Vedder had joined the band. With the addition of Dave Krusen on drums, the band took the name Mookie Blaylock, in reference to the then-active basketball player Mookie Blaylock. The band played its first official show at the Off Ramp Cafe in Seattle on October 22, 1990. They opened for Alice in Chains at the Moore Theatre in Seattle on December 22, 1990, and served as the opening act for the band's Facelift tour in 1991. Mookie Blaylock soon signed to Epic Records and renamed themselves Pearl Jam. In an early promotional interview, Vedder said that the name "Pearl Jam" was a reference to his great-grandmother Pearl, who was married to a Native American and had a special recipe for peyote-laced jam. In a 2006 Rolling Stone cover story however, Vedder admitted that this story was "total bullshit", even though he indeed had a great-grandma named Pearl. Ament and McCready explained that Ament came up with "pearl", and that the band later settled on "Pearl Jam" after attending a concert by Neil Young, in which he extended his songs as improvisations of 15-20 minutes in length.
Question: How did they form a band?
Answer: Stone Gossard and Jeff Ament were members of pioneering grunge band Green River during the mid-1980s.

Problem: Background: Young was born in Compton, California, the first child of Theodore and Verna Young. His middle name, Romelle, is derived from his father's amateur R&B singing group, The Romells. His parents married in 1964, separated in 1968, and divorced in 1972. His mother later remarried and had three children: sons Jerome and Tyree (both deceased) and daughter Shameka.
Context: Dr. Dre has said that his primary instrument in the studio is the Akai MPC3000, a drum machine and sampler, and that he often uses as many as four or five to produce a single recording. He cites 1970s funk musicians such as George Clinton, Isaac Hayes and Curtis Mayfield as his primary musical influences. Unlike most rap producers, he tries to avoid samples as much as possible, preferring to have studio musicians re-play pieces of music he wants to use, because it allows him more flexibility to change the pieces in rhythm and tempo. In 2001 he told Time magazine, "I may hear something I like on an old record that may inspire me, but I'd rather use musicians to re-create the sound or elaborate on it. I can control it better." Other equipment he uses include the E-mu SP-1200 drum machine and other keyboards from such manufacturers as Korg, Rhodes, Wurlitzer, Moog, and Roland. Dr. Dre also stresses the importance of equalizing drums properly, telling Scratch magazine in 2004 that he "used the same drum sounds on a couple of different songs on one album before but you'd never be able to tell the difference because of the EQ." Dr. Dre also uses the digital audio workstation Pro Tools and uses the software to combine hardware drum machines and vintage analog keyboards and synthesizers. After founding Aftermath Entertainment in 1996, Dr. Dre took on producer Mel-Man as a co-producer, and his music took on a more synthesizer-based sound, using fewer vocal samples (as he had used on "Lil' Ghetto Boy" and "Let Me Ride" on The Chronic, for example). Mel-Man has not shared co-production credits with Dr. Dre since approximately 2002, but fellow Aftermath producer Focus has credited Mel-Man as a key architect of the signature Aftermath sound. In 1999, Dr. Dre started working with Mike Elizondo, a bassist, guitarist, and keyboardist who has also produced, written and played on records for female singers such as Poe, Fiona Apple and Alanis Morissette, In the past few years Elizondo has since worked for many of Dr. Dre's productions. Dr. Dre also told Scratch magazine in a 2004 interview that he has been studying piano and music theory formally, and that a major goal is to accumulate enough musical theory to score movies. In the same interview he stated that he has collaborated with famed 1960s songwriter Burt Bacharach by sending him hip hop beats to play over, and hopes to have an in-person collaboration with him in the future.
Question: How did he learn to use this?
Answer:
He cites 1970s funk musicians such as George Clinton, Isaac Hayes and Curtis Mayfield as his primary musical influences.