Question: The mother of the first drummer for the Beatles owned what club?

Context paragraphs:
Songo music: Songo is a genre of popular Cuban music, created by the group Los Van Van in the early 1970s.  Songo incorporated rhythmic elements from folkloric rumba into popular dance music, and was a significant departure from the son montuno/mambo-based structure which had dominated popular music in Cuba since the 1940s.  Blas Egües was the first drummer in Los Van Van, but it was the band's second drummer, José Luis Quintana "Changuito", who developed songo into the world-wide phenomenon it is today.

Kevin Mahon: Kevin Mahon is an American drummer.  He was the first drummer for punk band Against Me! , appearing on their Vivida Vis!  demo, "Against Me!  EP", and "Crime as Forgiven By" EP.  Mahon originally joined Against Me!  in 1998, playing as a duo with Laura Jane Grace.  Mahon left Against Me!  in April 2001 after a van accident.  He lives in Brooklyn, NY and played drums in Forgetters from 2009 to 2013.

Pete Best: Randolph Peter "Pete" Best (born Randolph Peter Scanland, 24 November 1941) is an English musician, principally known as an original member and first drummer of the Beatles, from 1960 to 1962.  He has been referred to as the Fifth Beatle.

Subsignal: Subsignal is a progressive rock band.  The band was originally formed as a side project by Sieges Even members Arno Menses (vocals) and Markus Steffen (guitars).  After their main band disbanded, Menses and Steffen recruited former Dreamscape members Ralf Schwager (bass), and David Bertok (keyboards).  Sun Caged drummer Roel van Helden was Subsignal's first drummer, but was replaced in 2012 by Dreamscape drummer Danilo Batdorf.

Keith Baker (musician): Keith Baker (born 14 April 1948) is a drummer, best known for a brief stint with Uriah Heep.  He played for Bakerloo, but left the group following the release of its only album.  He subsequently became the first drummer of Supertramp (then called Daddy) between late 1969 and early 1970.  Baker joined Uriah Heep prior to their second album "Salisbury", replacing Nigel Olsson.  He recorded the album with the group, but left when he did not want to tour extensively with the band and was replaced by Ian Clarke.

Mona Best: Mona "Mo" Best (3 January 1924 – 9 October 1988) was a British music club proprietor, best known as the owner of The Casbah Coffee Club, a club in Liverpool which served as a venue for rock and roll music during the late 1950s and 1960s.  Among the bands to play at The Casbah was The Beatles, for whom her son Pete Best was a drummer at the time.  Mona also had two other sons, Rory (b. 1944), and Vincent "Roag" Best (b. 1962).  It was later confirmed that Roag's father was The Beatles' associate, Neil Aspinall, although he was not registered as the father on Roag's birth certificate.

Reg Isidore: Reg Isidore (4 April 1949 – 22 March 2009) was a rock drummer best known for his work with Robin Trower.  Isidore was Trower's first drummer and he played on the Robin Trower Band's first two albums "Twice Removed from Yesterday" and "Bridge of Sighs". i, in the early days he played with Peter Bardens.

Gasolin': Gasolin' was a Danish rock band from Christianshavn in Copenhagen formed by Kim Larsen, Franz Beckerlee and Wili Jønsson in 1969.  Their first drummer was the late Bjørn Uglebjerg.  He was replaced by Søren Berlev in 1971.  At the formation the guitar playing of Franz Beckerlee was inspired by Jimi Hendrix and the singing and lyrics of Larsen was inspired by Bob Dylan, while the rhythm playing of Jønsson and Berlev owed much to The Beatles.  However, they would soon develop their own musical style.  The pop sensibility of Kim Larsen, the artistic attitude of Franz Beckerlee and the musical competence of Wili Jønsson would prove to be a recipe for success.  Gasolin's lyrics were generally written by the entire group, often with the assistance of friend Mogens Mogensen.

Egó: Egó was a musical band founded in Reykjavík, Iceland), in the fall of 1981 by Bubbi Morthens with his younger brother and guitarist Bergþór Morthens and their friend, bassist Þorleifur Guðjónsson.  Egó's first drummer was Jóhann Ridar (aka “Motorhead”), and for a while guitarist Ragnar Sigurðsson played along with them.  Jóhann and Ragnar were replaced by drummer Magnús Stefánsson and Tómas Magnús Tómasson.  Bubbi Morthens, the frontman and main lyricist in the band had been part of influential punk/rock/reggie band Utangarðsmenn, but had been fired from the band for reportedly having a "big ego", which was also allegedly the reason for the band name "Egó".

Kyle Gass Band (album): Kyle Gass Band is the debut studio album by American comedy rock band Kyle Gass Band, released independently in 2013 and re-released for Europe in 2015 by SPV GmbH and Steamhammer Records.  Despite not playing on the album, third drummer Tim Spier appears on the 2015 album cover instead of first drummer Nate Rothacker.

Supporting paragraphs: Mona Best Pete Best
Answer: The Casbah Coffee Club