Question: Bob Mould and Moonbabies, have which mutual occupations?
Context: Silver Age is the tenth solo album from former Hüsker Dü and Sugar frontman Bob Mould.  Mould was joined on bass by Jason Narducy and on drums by Superchunk's Jon Wurster. Moonbabies is a Swedish duo formed in 1997 by vocalists, multi-instrumentalists, producers, and songwriters Ola Frick (Vocals, guitar and various instruments) and Carina Johansson (Vocals and keyboards).  Their earliest efforts recalled early Indie/Shoegazer influences by bands like My Bloody Valentine and Cocteau Twins, but with their 2004 album "The Orange Billboard", developed into more sophisticated pop music with a touch of The Beach Boys and The Beatles, as well as experimentation with electronics.  The Single/Mini-album War on Sound was released in 2005 and became an immediate indie-anthem and followed success on radio and TV-shows like Grey's Anatomy.  In 2007 "Moonbabies at the Ballroom" was released, a somewhat more constructed and song-oriented album including Take me to the Ballroom, Shout it Out, Walking on my Feet and Cocobelle which all were frequently aired on college radio world-wide and included in several TV shows and commercials.  Their comeback album Wizards on the Beach was released in April 2015. Bob Mould (sometimes referred to as Hubcap) is the third solo album by former Hüsker Dü and Sugar guitarist and singer Bob Mould.  It was recorded and mixed between September & November 1995 and released in April 1996.  Mould played all of the instruments on the album himself, and the sleeve notes declare, "This one is for me."  In the place of traditional band credits, the sleeve states, "Bob Mould is Bob Mould." Black Sheets of Rain is the second solo album by former Hüsker Dü guitarist and singer Bob Mould and features the Modern Rock Top 10 hit "It's Too Late."  The album was a return to a heavier sound following his folk influenced solo debut, "Workbook".  Bassist Tony Maimone and drummer Anton Fier, both veterans of Pere Ubu, once again served as Mould's rhythm section. Hüsker Dü was an American rock band formed in Saint Paul, Minnesota, in 1979.  The band's continual members were guitarist/vocalist Bob Mould, bassist Greg Norton, and drummer/vocalist Grant Hart.  Hüsker Dü first gained notability as a hardcore punk band, later crossing over into alternative rock.  Mould and Hart were the principal songwriters for Hüsker Dü, with Hart's higher-pitched vocals and Mould's baritone taking the lead in alternating songs. Circle of Friends is a DVD by Bob Mould of a live concert recorded in 2005 at the in Washington, D.C.  The performance included songs from Mould's earlier bands Hüsker Dü and Sugar, as well as his solo work.  This particular show was part of the "Body of Song" tour, Mould's first non-solo tour for over a decade and the first one in which Hüsker Dü material was played in a band format since the band broke up in 1988. Warehouse: Songs and Stories (1987) is the sixth and final studio album by alternative rock band Hüsker Dü, originally released by Warner Bros.  Records as a double album on two vinyl LPs.  The band dissolved following the tour in support of its release, in part due to disagreements between songwriters Bob Mould and Grant Hart over the latter's drug use.  This album, along with "Candy Apple Grey", showcases the increasing maturity of Mould and Hart's writing—a change which alienated some long-time fans.  This album is also known for its battle between the two songwriters, with Mould famously telling Hart that he would never have more than half of the songs on a Hüsker Dü album. Robert Arthur Mould (born October 16, 1960) is an American musician, principally known for his work as guitarist, vocalist and songwriter for alternative rock bands Hüsker Dü in the 1980s and Sugar in the 1990s. Poison Years is a compilation album by Bob Mould, who had been the guitarist and co-vocalist of the influential American rock band Hüsker Dü.  It is essentially a condensed version of Mould's first two solo albums on Virgin Records, "Workbook" (1989) and "Black Sheets of Rain" (1990), and was released in mid-1994 after Mould had achieved considerable success with his new band Sugar.  It contains 6 (out of 11) studio tracks from "Black Sheets" and 5 (out of 11) tracks from "Workbook", of which 3 are previously unreleased live versions.  In addition, the album contains a studio outtake from the "Workbook" period, "All Those People Know", a live version of another non-album track, "If You're True", and a live cover version of "Shoot Out The Lights" from the eponymous 1982 album by Richard and Linda Thompson. Copper Blue is the debut studio album by American alternative rock band Sugar.  It was voted 1992 Album of the Year by the NME.  All of the songs were written by guitarist/vocalist Bob Mould, who also co-produced with Lou Giordano.  The song "The Slim" is about losing someone to AIDS.  Musically, the band continues the thick punk guitar of Mould's previous band, Hüsker Dü, while slowing the tempo and emphasizing melody even more.
Answer: guitarist, vocalist and songwriter