Question: Are Caesars and Primus both rock bands?
Context: Japanese rock (Japanese: 日本のロック , Hepburn: Nihon no Rokku ) , sometimes abbreviated to , is rock music from Japan.  Influenced by American and British rock of the 1960s, the first rock bands in Japan performed what is called Group Sounds, with lyrics almost exclusively in English.  Folk rock band Happy End in the early 1970s are credited as the first to sing rock music in the Japanese language.  Punk rock band the Blue Hearts and heavy metal group X Japan, led Japanese rock bands in the late 1980s and early 1990s by achieving major mainstream success.  Japanese rock music has become a cult worldwide, being widely known in Asia and has survived through decades competing with its contemporary derivative local style J-pop. Furthur was a rock band founded in 2009 by former Grateful Dead members Bob Weir and Phil Lesh.  The original lineup also included John Kadlecik of the Dark Star Orchestra on lead guitar, Jeff Chimenti of RatDog on keyboards, Jay Lane of RatDog on percussion, and Joe Russo of the Benevento/Russo Duo on drums.  Named after the famous touring bus used by Ken Kesey and the Merry Pranksters in the 1960s, Furthur was an improvisational jam band that performed music primarily from the extensive Grateful Dead songbook, as well as their own original music and that of several other well-known artists.  In addition to the original members (with the exception of Jay Lane, who left the band in March 2010 to rejoin his previous band, Primus), the band's lineup included backup vocalists Sunshine Becker of the a cappella ensemble SoVoSó and Jeff Pehrson of the folk rock bands Box Set and the Fall Risk. Caesars are a Swedish indie rock band.  In their native Sweden, the band was originally known as Caesars Palace, a name which was changed to avoid conflicting with the name of the Las Vegas hotel.  In the rest of Scandinavia they are known as Twelve Caesars.  Elsewhere they go by the name Caesars. Susumu Hirasawa (平沢 進 ) (born April 1, 1954) is a Japanese musician and composer.  In the fifth year of elementary school, Hirasawa took up the electric guitar, inspired by the surf and instrumental rock bands he heard on the radio and on TV, later joining his junior high school's band.  In 1973 he formed Mandrake, a progressive rock band that incorporated elements from heavy metal and krautrock.  Being one of the few Japanese progressive rock bands of its time, Mandrake achieved little success and released no albums during its lifetime.  After discovering punk rock and working on synthesizer-heavy projects, Hirasawa felt that progressive rock became just for entertainment and decided to reform the band as the electronic rock band P-Model in 1979.  Originally met with success, they turned to decidedly uncommercial post-punk and experimental rock after Hirasawa went through an averse reaction to his fame.  With Hirasawa at the forefront, the band went through various lineups and achieved some popularity in the Japanese independent music scene. Demons are a punk rock/garage punk band from Sweden.  The band includes quotation marks in their name to differentiate themselves from other bands with a similar name.  Their music has been described as "punk 'n' roll", but the band claims it should only be described as high-energy rock.  Their musical style relies heavily on the energy derived from punk rock.  Influences include 1960s garage rock bands such as The Sonics, The Standells and Shadows of Knight, The Velvet Underground, The Stooges and New York Dolls; and punk rock bands such as The Damned, The Heartbreakers and The Saints; and early hardcore punk bands such as Black Flag, Bad Brains and Dead Kennedys.  "Demons" has often been compared to contemporary groups like New Bomb Turks, The Hellacopters and Electric Frankenstein. June 2010 Rehearsal is an extended play by the American rock band Primus released on August 5, 2010 worldwide.  The EP has been released digitally from Primus' official website for free.  It is the first Primus release to feature original drummer Jay Lane, who left the band before their debut, "Suck on This". G.a.s. Drummers was a melodic hardcore band formed in Jerez de la Frontera, Spain at the end of 1997 by three teenagers who stood out from their other students due to their colourful hair dies and their taste in the california punk rock bands such as Bad Religion, Operation Ivy, NOFX, Lagwagon, The Descendents etc.  Original members from other small local bands Dani Llamas (guitar and vocals), Pakomoto (Bass and vocals) and Rafa Camison (Drums) started playing together and composing their own music and after one year of sending demos around the country they got put as the opening act for Swedish Punk Rock band Randy on their Spanish tour.  A tour that took the band through the whole country helping a lot of Spanish kids discover that there were actually Spanish bands capable of sounding as good as some of their favorite American bands.  This lead immediately the band to sign to a young record label called Slide Chorus Records a young emerging record label from Madrid which would start releasing albums for other Spanish Punk Rock bands.  This first release titled Proud To Be Nothing hit the streets at the end of 1999 and was presented on their first European tour which covered Spain, Great Britain, France and the Netherlands amongst Spanish punk rock legend[P.P.M. Skate punk (also known as skate rock, skatecore and skate-thrash) is a skater subculture and a subgenre of punk rock music.  Originally a genre of hardcore punk, skate punk changed into a more melodic genre of punk rock in the 1990s.  The term usually describes the sound of 1990s punk rock bands that have a fast, melodic sound, and similar 21st-century punk rock bands.  Skate videos have traditionally featured this fast style of punk rock.  This played a big part in the coining of the term "skate punk". Haitian rock, or rock kreyòl, started as rock n roll in Haiti in the early 1960s.  It was played by rock bands called "yeye" bands.  The name "yeye" derives from the Beatles lyrical verse, "yeah, yeah, yeah", which took off in the United States and was listened to by upper class Haitian families who had access to the radio.  Young Haitians formed small electric guitar-based bands.  These "yeye" rock bands were short-lived, as the addition of "compas" to their repertoires resulted in a sound was called mini-jazz, or "mini-djaz" in creole. Primus is an American rock band based in San Francisco, California, currently composed of bassist/vocalist Les Claypool, guitarist Larry "Ler" LaLonde and drummer Tim "Herb" Alexander.  Primus originally formed in 1984 with Claypool and guitarist Todd Huth, later joined by drummer Jay Lane, though the latter two departed the band at the end of 1988.  Featuring LaLonde and Alexander, Primus recorded their debut "Suck on This" in 1989, followed by four studio albums: "Frizzle Fry", "Sailing the Seas of Cheese", "Pork Soda", and "Tales from the Punchbowl".  Alexander left the band in 1996, replaced by Bryan "Brain" Mantia, and Primus went on to record the original theme song for the TV show "South Park" and two more albums, "Brown Album" and "Antipop", before declaring a hiatus in 2000.
Answer: yes