Question: What are Broken Bells and Muse both classified as?
Context: Broken Bells is the self-titled debut album from Broken Bells, consisting of James Mercer of indie rock band The Shins with producer and multi-instrumentalist Brian Burton (aka Danger Mouse), and was released on March 9, 2010. Meyrin Fields is the first EP by the alternative rock band Broken Bells, made up of unreleased tracks from their debut album, "Broken Bells".  The instrumental version of "An Easy Life" was originally released as the b-side of "The High Road" single, and released with the vocals on the iTunes LP edition of their self-titled album, and "Meyrin Fields" was originally the b-side of "The Ghost Inside."  "Heartless Empire" was originally released as an instrumental, with strings replacing the vocals, which could be heard upon opening the music box edition of their 2010 self-titled album. Muse are an English rock band from Teignmouth, Devon, formed in 1994.  The band consists of Matt Bellamy (lead vocals, guitar, piano, keyboards), Chris Wolstenholme (bass guitar, backing vocals, keyboards) and Dominic Howard (drums, percussion). Jon Sortland (born September 12, 1973) is an American musician, currently playing the drums for indie rock band The Shins.  Sortland also drums, plays bass and keyboards and provides backing vocals in the band Broken Bells.  Sortland is also the drummer and singer in the band E V Kain.  Sortland is endorsed by Paiste and C&C Drums. Broken Bells is an American indie rock band composed of artist-producer Brian Burton (better known as Danger Mouse) and James Mercer, the lead vocalist and guitarist for the indie rock band The Shins.  Broken Bells compose and create as a duo, but are joined by Dan Elkan and Jon Sortland when performing live.  The previous live band included Conor Oberst and the Mystic Valley Band sidemen Nate Walcott and Nik Freitas, and Jonathan Hischke and Dan Elkan, both ex-members of Hella.  Following their 2010 self-titled debut album, the duo released an EP, "Meyrin Fields", in 2011 and their second studio album, "After the Disco", on February 4, 2014. Davey Brozowski (born October 17, 1982) is a drummer and percussionist from Seattle, WA.  He currently tours with Modest Mouse as their percussionist.  Other acts include Cayucas, The Catheters, Black Whales, and Tall Birds.  In 2010 Brozowski also toured with Broken Bells as their live percussionist alongside Brian Burton aka Dangermouse.  He also played drums songs during the set when Burton would move to keys or guitar. Jason Torbert is an American musician currently in the solo project, Goddamn Electric Bill on the record label 99X/10 (founded by keyboardist Roger O'Donnell of The Cure (and previously, The Psychedelic Furs, Thompson Twins and Berlin)).  Torbert has also performed bass in several other bands, including Cigar (with Jon Sortland (The Shins, Broken Bells) and Rami Krayem) and Sing The Body Electric (with Damon DeLapaz and Adam Lewis (Fenix TX)). Dan Elkan (born September 7, 1978) is an American singer-songwriter and producer, who is best known as the singer and guitarist for the rock band Them Hills.  Elkan has performed live with Broken Bells, Hella and Kim Deal and has appeared on recordings by Hella, Team Sleep, Norah Jones and Zach Hill.  Elkan produced Aaron Ross' 2007 album "Shapeshifter" and tracks for Golden Shoulders' "Get Reasonable" 2009.  Elkan also co-produced Zach Hill & Holy Smokes' "Masculine Drugs" 2004 and Holy Smokes' "Talk to Your Kids about Gangs" 2006 as well as Alela Diane's 2009 album "To Be Still". Nik Freitas is a singer-songwriter from Visalia, California and currently residing in Los Angeles.  Freitas began his career as a staff photographer for Thrasher Magazine where he traveled the world taking skate photos until turning his attention to music full-time in 2001.  Since then, Freitas has released four records, almost all of which were produced entirely by him (he plays every instrument).  Stylistically similar to musicians like The Beatles, Paul Simon and Elliott Smith, his fourth album, "Sun Down" was released in 2008 by Conor Oberst's Team Love Records, leading to increased publicity.  He has also participated with Oberst's back-up band, the Mystic Valley Band, performing two of his own songs on their debut album Outer South.  He has been part of the performing band for the Broken Bells on their tour and also tours as a solo act to support his fifth album, "Center of the World". Port of Morrow is the fourth studio album by American rock band The Shins.  The album was released March 19, 2012, on Aural Apothecary and Columbia Records and was co-produced by Greg Kurstin and frontman James Mercer.  The Shins' first studio album in five years, following the release of 2007's "Wincing the Night Away", followed major lineup changes in the group: founding members Dave Hernandez (bass, guitar), Marty Crandall (keyboards) and Jesse Sandoval (drums) departed in 2009.  Mercer deemed it an "aesthetic decision" to part ways with his bandmates, and in the interim, founded side project Broken Bells with Danger Mouse.
Answer: rock band