Question: how is Bikini Kill and Underworld connected?

Context articles: Slim Moon
Reject All American
Bikini Kill (EP)
Bikini Kill
Pussy Whipped
The Singles (Bikini Kill album)
Le Tigre
Our Troubled Youth
Yeah Yeah Yeah Yeah
Underworld (band)

Slim Moon (b. Matthew Moon on October 15, 1967) is the founder of the independent music label, Kill Rock Stars.
 He also started its sister label, 5 Rue Christine.
 Slim ran KRS from 1991 to 2006, during which time KRS released albums by dozens of artists including Sleater-Kinney, Elliott Smith, The Decemberists, Miranda July, Bikini Kill, Unwound, Huggy Bear, The Gossip, and Linda Perry.
 Slim and his wife, who now runs KRS, decided to make 5RC dormant, and in 2007 5RC released its final records for the present time.
Reject All American is the final studio album by the American punk rock band Bikini Kill, released on April 5, 1996 by Kill Rock Stars.
 The album received generally favorable reviews from music critics.
Bikini Kill is the first EP by the American punk rock band Bikini Kill led by singer Kathleen Hanna.
 The six-song vinyl EP was released in 1992 on Kill Rock Stars.
 It was produced by Fugazi's Ian MacKaye.
 In 1994, the EP was released on CD together with the "Yeah Yeah Yeah Yeah" EP under the name "The CD Version of the First Two Records".
Bikini Kill was an American punk rock band formed in Olympia, Washington, in October 1990.
 The group consisted of singer and songwriter Kathleen Hanna, guitarist Billy Karren, bassist Kathi Wilcox, and drummer Tobi Vail.
 The band is widely considered to be the pioneer of the riot grrrl movement, and was known for its radical feminist lyrics and fiery performances.
 Their music is characteristically abrasive and hardcore-influenced.
 After two full-length albums, several EPs and two compilations, they disbanded in 1997.
Pussy Whipped is the debut studio album by American punk rock band Bikini Kill.
 It was released on Kill Rock Stars on October 26, 1996.
 It includes the track "Rebel Girl", which is number 27 on the "Rolling Stone" list of "Most Excellent Songs of Every Year Since 1967", a playlist assembled by the magazine in 2006 to celebrate its 1,000th issue.
The Singles is a compilation album of three singles by punk rock band Bikini Kill.
 The album was released in 1998 by Kill Rock Stars.
 Joan Jett produces, plays guitar and sings on the first three tracks.
Le Tigre ( ) is an American electroclash band from the United States, formed by Kathleen Hanna (formerly of Bikini Kill) and Johanna Fateman in 1998 in New York City.
 It also featured Sadie Benning from 1998 until 2001 and JD Samson for the rest of the group's run.
 Le Tigre is known for its left-wing sociopolitical lyrics, dealing with issues of feminism and the LGBT community.
Our Troubled Youth is the Huggy Bear side of a split album they released with Bikini Kill (whose side was entitled "Yeah, Yeah, Yeah, Yeah").
 It was released on International Women's Day 1993 on Catcall Records in the United Kingdom, and on the Kill Rock Stars label in the United States.
Yeah Yeah Yeah Yeah is the Bikini Kill side of a split album between American and English riot grrrl bands Bikini Kill and Huggy Bear.
 It was released in 1993 on Kill Rock Stars.
 The Huggy Bear side was entitled "Our Troubled Youth".
 Bikini Kill reissued their side on their imprint Bikini Kill Records on April 15, 2014.
 They did not have the rights to the Huggy Bear side, and instead paired it with unreleased live tracks.
Underworld are a British electronic group formed in 1980 in Cardiff and the principal name under which musicians Karl Hyde and Rick Smith have recorded together.
 Darren Price has toured with the band since 2005, after the departure of Darren Emerson in 2000.
 Known for visual style and dynamic live performances, Underworld have influenced a wide range of artists and been featured in soundtracks and scores for films, television and the 2012 Summer Olympics in London.