Question: head of Their Time is a live album by The Mothers of Invention, it was recorded at which 2,500-seat concert venue in London?

Context paragraphs:
Queen's Hall: The Queen's Hall was a concert hall in Langham Place, London, opened in 1893.  Designed by the architect Thomas Knightley, it had room for an audience of about 2,500 people.  It became London's principal concert venue.  From 1895 until 1941, it was the home of the promenade concerts ("The Proms") founded by Robert Newman together with Henry Wood.  The hall had drab decor and cramped seating but superb acoustics.  It became known as the "musical centre of the [British] Empire", and several of the leading musicians and composers of the late 19th and early 20th century performed there, including Claude Debussy, Edward Elgar, Maurice Ravel and Richard Strauss.

Royal Festival Hall: The Royal Festival Hall is a 2,500-seat concert, dance and talks venue within Southbank Centre in London.  It is situated on the South Bank of the River Thames, not far from Hungerford Bridge, in the London Borough of Lambeth.  It is a Grade I listed building, the first post-war building to become so protected (in 1981).  The London Philharmonic Orchestra, the Philharmonia Orchestra and the Orchestra of the Age of Enlightenment are resident in the hall.

Jovel Music Hall: The Jovel Music Hall is a 1,500-seat concert venue located in Münster, Germany.  Notable past performers include Motörhead, Duran Duran and Blue Öyster Cult.

Live in Muenster, 2003: Live in Muenster, 2003 is a live album by Joan of Arc, released in 2004 on Record Label Record Label.  It was recorded live at , a concert venue in Muenster, Germany, on May 17, 2003.

Playground Psychotics: Playground Psychotics is a two-CD live album by Frank Zappa and the Mothers of Invention.  It was originally released in 1992 through his mail order label, Barking Pumpkin, and was re-released in 1995 through Rykodisc.  The album features recordings of Zappa and his band, the Mothers of Invention, around the time of the film "200 Motels".  The live material on "Playground Psychotics" is interspersed with excerpts from taped conversations among band members whilst on tour, and the release includes three conceptual sections: "A Typical Day on the Road, Part 1", a collage of dialogue which opens the first disc; "A Typical Day on the Road, Part 2", which opens the second disc and "The True Story of 200 Motels", which appears at the end of disc two.  The album also includes a live session with John Lennon and Yoko Ono, an alternate mix of which appears on Lennon's "Some Time in New York City" (1972).

Royal Birmingham Conservatoire: The Royal Birmingham Conservatoire (formerly known as Birmingham Conservatoire) is a conservatoire and concert venue in Birmingham, England.  It houses a 500-seat concert hall as well as many other performance spaces including a recital hall, organ studio and a dedicated jazz club.  It is the only one of the nine conservatoires in the United Kingdom that is also a faculty of a university, in this case Birmingham City University.  In 2008, as part of the university’s reorganisation of faculties, it became a part of the Faculty of

Fox Oakland Theatre: The Fox Oakland Theatre is a 2,800-seat concert hall, a former movie theater, located at 1807 Telegraph Avenue in downtown Oakland, California.  It originally opened in 1928, running films until 1970.  Designed by Weeks and Day, the theatre is listed on the National Register of Historic Places.  It was refurbished in the 2000s and reopened as a concert venue on February 5, 2009.

Live Bullet: ‘Live’ Bullet is a live album by American rock band Bob Seger & the Silver Bullet Band, released in April 1976.  It was recorded at Cobo Hall in Detroit, Michigan, during the heyday of that arena's time as an important rock concert venue.  The album is credited, along with "Night Moves", with launching Seger's mainstream popularity.

Ahead of Their Time: Ahead of Their Time is a live album by The Mothers of Invention.  It was recorded at the Royal Festival Hall, London, England, on October 25, 1968, and released in 1993 on CD by Barking Pumpkin.  It was subsequently reissued on Rykodisc in 1995.

Symphony Hall, Birmingham: Symphony Hall is a 2,262 seat concert venue in Birmingham, England.  It was officially opened by the Queen on 12 June 1991, although it had been in use since 15 April 1991.  It is home to the City of Birmingham Symphony Orchestra and hosts around 270 events a year.  It was completed at a cost of £30 million.  The hall's interior is modelled upon the Musikverein in Vienna and the Concertgebouw in Amsterdam.  The venue, managed alongside Town Hall, presents a programme of jazz, world, folk, rock, pop and classical concerts, organ recitals, spoken word, dance, comedy, educational and community performances, and is also used for conferences and business events as part of the International Convention Centre.

Supporting paragraphs: Ahead of Their Time Royal Festival Hall
Answer: Royal Festival Hall