Background: Pavement was an American indie rock band that formed in Stockton, California in 1989. The group mainly consisted of Stephen Malkmus (vocals and guitar), Scott Kannberg (guitar and vocals), Mark Ibold (bass), Steve West (drums) and Bob Nastanovich (percussion and vocals). Initially conceived as a recording project, the band at first avoided press or live performances, while attracting considerable underground attention with their early releases. Gradually evolving into a more polished band, Pavement recorded five full-length albums and nine EPs over the course of their decade-long career, though they disbanded with some acrimony in 1999 as the members moved on to other projects.
Context: During the Slanted & Enchanted tour, Gary Young's eccentric behavior increased, and he would stage incidents such as handing out cabbage and mashed potatoes to fans at the door of the venue, doing handstands, drunkenly falling off his drum stool, and running around the venue while the rest of the band was playing. The band only understood how severe Young's drinking problem was after Pavement's first few tours. Malkmus later told Tape Op, "We knew that he was like a hippie and kinda flaky, but we didn't know he had such a bad drinking problem. We found out on that tour, because he really got sick from being nervous... That's why I let Bob be in the band...'Keep the beat going if Gary passes out.'" In 1993, Malkmus attempted to record some new songs at Young's studio with unsuccessful results. The singer later said, "We kind of wanted to not record with him anymore, but we were too nice to fire people or even really talk about it... We tried to record there, but it wasn't sounding good and he didn't have his studio ready and he was also in a drinking funk."  At the conclusion of a 1993 tour of Australia, Japan, and Europe, the group held a meeting in a hotel room in Copenhagen during which Malkmus, Kannberg and Ibold remained silent while Nastanovich (Young's best friend at the time) argued with the drummer and informed him that his antics were unnecessary. Young ultimately agreed to leave the band. He was replaced by Steve West, who had been a fellow museum security guard at the Whitney Museum of American Art along with Malkmus and David Berman. West's debut performance was in 1993 at a Drag City festival in Chicago. Also that same year, the band contributed to the AIDS-Benefit Album No Alternative produced by the Red Hot Organization with their song "Unseen Power of the Picket Fence".  Pavement's second album Crooked Rain, Crooked Rain was released in 1994. The record was more indebted to the classic rock tradition than their debut. The single "Cut Your Hair" was the band's closest brush with the mainstream, and briefly enjoyed airplay on alternative rock radio and MTV. Pavement performed the song on The Tonight Show with Jay Leno. The video also aired on "Career Day", a season five episode of Beavis and Butt-head, who termed it "buttwipe music" and also wanted the band to "try harder."  The lyrics from another single from the album, "Range Life", criticized alternative rock stars The Smashing Pumpkins and the Stone Temple Pilots. Malkmus has insisted over the years that the line is meant to be light-hearted and is sung from the point of view of the aging hippie character in the song. Later live versions of the track had the singer substituting "The Spice Girls", "Counting Crows", or others for "Stone Temple Pilots". In response Smashing Pumpkins leader Billy Corgan threatened to drop his band from their slot headlining the 1994 Lollapalooza Festival if Pavement was allowed to play. Corgan and Malkmus would trade barbs through the press for several years afterwards.
Question: Who was in the band?. Whats the answer?