Question: Which musician performed with Stephen Malkmus and the Jicks, Jon Spencer or Stephen Malkmus?

Context articles: Pavement discography
Jon Spencer
Stephen Malkmus (album)
Wig Out at Jagbags
Janet Weiss
Mirror Traffic
Stephen Malkmus and the Jicks
Stephen Malkmus
Mike Clark (indie rock musician)
Pig Lib

The discography of Pavement, a Stockton, California-based indie rock group, consists of five studio albums, four double-length reissues, one compilation, ten extended plays, and five singles.
 This list does not include material performed by members or former members of Pavement that was recorded with Stephen Malkmus and the Jicks, Silver Jews, Preston School of Industry, Free Kitten, The Crust Brothers, or any other associated solo or side projects.
Jon Spencer (born 1965) is an American singer, composer and guitarist.
 He has been involved in multiple musical acts, such as Pussy Galore, Boss Hog, Heavy Trash and The Jon Spencer Blues Explosion.
Stephen Malkmus is the debut album by Stephen Malkmus, released on February 13, 2001 by Matador Records.
 Malkmus had planned to create the record by himself, or through a smaller, local label, but eventually accepted the offer Matador asked, and he released it.
 Pre-release promotional CDs of the album exist under the working titles "Jicks" and "Swedish Reggae".
 Malkmus intended to release the album as The Jicks, but Matador insisted that the album be released under his own name.
 The album peaked at #124 in the US and #49 in the UK.
Wig Out at Jagbags is an album by Stephen Malkmus and the Jicks.
 It was released on January 7, 2014 by Matador Records.
Janet Lee Weiss (born September 24, 1965) is a rock drummer, best known as a member of Sleater-Kinney and currently also a member of Quasi.
 She was the drummer for Stephen Malkmus and the Jicks, leaving after the album "Mirror Traffic", and contributed to The Shins' fourth studio album, "Port of Morrow" (2012).
 She was also the drummer for Wild Flag.
 Weiss is highly regarded as a drummer; "Stylus Magazine" listed her as one of rock's fifty greatest drummers, while "LA Weekly" places her in the top twenty.
Mirror Traffic is an album by Stephen Malkmus and the Jicks, released on August 23, 2011 by Matador Records.
 It is the first collaboration between Stephen Malkmus and producer Beck and also the last album to feature drummer Janet Weiss, who moved on to become a member of Wild Flag.
 As of November 2013, the album has sold 30,000 copies in the U.S. according to Nielsen SoundScan.
Stephen Malkmus and the Jicks is a rock band consisting of Stephen Malkmus, Mike Clark, Joanna Bolme, and Jake Morris.
 Malkmus was the main singer and songwriter behind the influential 1990s indie rock band Pavement.
Stephen Joseph Malkmus (born May 30, 1966) is an American musician best known as the lead singer and guitarist of the indie rock band Pavement.
 He currently performs with Stephen Malkmus and the Jicks.
Mike Clark is an American musician and restaurateur based in Portland, Oregon.
 He currently plays keyboards and guitar for Stephen Malkmus and the Jicks.
Pig Lib is the second studio album by Stephen Malkmus and the Jicks, released on March 18, 2003 by Matador Records.
 It peaked at #97 in the U.S. and #63 in the UK.
 The first pressing of the record came with a bonus disc containing five never before released songs.
 As of June 2004, the album has sold 49,000 copies in the U.S. according to Nielsen SoundScan.