Polymarchs is the name of a mobile DJ collective (or SONIDERO) based in Mexico City which plays Electronic dance music.
 Polymarchs was created in the late 1970s as a mobile DJ collective by Oaxacan native, Apolinar Silva de la Barrera and his sister Maria during the Disco music phenomenon of the 1970s.
 It began playing shows in distinct Mexico City neighborhoods and began headlining successful sold out shows by the early 1980s.
 By the late 1980s as the overall popularity of Disco music diminished in Mexico, Polymarchs was one of the selected few that successfully changed its musical format to appeal to younger audiences.
 As of 2012, Polymarchs continues to be active in the Mexico City area with its resident DJ actively performing in events throughout the area.
Catherine was an alternative rock band from Chicago, Illinois that was active from 1985 to 1998.
 They were signed to TVT Records.
Ron Bottcher (11 May 1940 – 12 April 1991) was an American operatic baritone who was actively performing with both the New York City Opera (NYCO) and the Metropolitan Opera during the 1960s.
 A native of Sandpoint, Idaho, he earned music degrees from the University of Montana and the Curtis Institute of Music.
 He made his debut at the Santa Fe Opera in the summer of 1961, where he portrayed the roles of Leopold in Richard Strauss' "Der Rosenkavalier", Marcello in Giacomo Puccini's "La bohème", and the Head waiter in Paul Hindemith's "Neues vom Tage".
 His roles at the NYCO included Escamillo in Georges Bizet's "Carmen" and Sharpless in Puccini's "Madama Butterfly" among others.
 At the Met he created roles in the world premieres of Samuel Barber's "Antony and Cleopatra" and Marvin David Levy's "Mourning Becomes Electra".
 He died at the age of 50 at Lenox Hill Hospital in Manhattan of AIDS related illness.
Sound Team was an American band based in Austin, Texas that formed in 2000 around principal songwriters Bill Baird and Matt Oliver.
 For most of their recording career, Sound Team consisted of Bill Baird (bass, guitar, vocals), Matt Oliver (guitar, piano, vocals), Jordan Johns (drums, percussion), Sam Sanford (guitar), Michael Baird (synthesizer, tapes) and Gabe Pearlman (organ).
 Sanford and Michael Baird left the group in 2006.
 The band continued to record and tour briefly with a new lineup, but finally disbanded in late 2007.
The Philadelphia Civic Opera Company (PCOC) was an American opera company located in Philadelphia, Pennsylvania, that was actively performing between 1924 and 1930.
 Founded by Philadelphia socialite Mrs. Henry M. Tracy, the company was established partially through funds provided by the city of Philadelphia and its then-mayor, W. Freeland Kendrick.
 The company was led by Artistic Director Alexander Smallens.
 Tracy served as the company's President and ran the business side of the organization while Smallens served as the company's primary conductor and made all of the artistic decisions.
 W. Attmore Robinson was later brought in to help Smallens with some of the artistic direction.
 The company performed between 10 and 15 operas every year during an annual season until it went bankrupt a year after the Wall Street Crash of 1929.
Fred Stone (sometimes given as Freddie Stone) (9 September 1935 – 10 December 1986) was a Canadian flugelhornist, trumpeter, pianist, composer, writer, and music educator.
 He worked as a soloist within both the classical and jazz repertoires from the 1950s through the early 1970s, notably appearing in concerts with the Duke Ellington Orchestra, the Toronto Symphony Orchestra, the Winnipeg Symphony Orchestra, the Detroit Symphony Orchestra, the Cleveland Orchestra, the Buffalo Philharmonic Orchestra, the Ottawa Symphony Orchestra, and the San Diego Symphony.
 Between 1971 and 1983 he mainly focused on his work as a composer and teacher, making only periodic public performances.
 In 1984 he resumed actively performing when he formed "Freddie's Band", a jazz ensemble in residence at The Music Gallery in Toronto.
 He performed with this group up until his death two years later.
This is a list of special episodes of the professional wrestling television series "WWE SmackDown".
 Throughout its broadcast history, the show has aired editions that have different themes.
 Some of them are yearly events such as the WWE draft and the Slammy Awards. Others include tributes to various professional wrestlers who have recently died or retired from actively performing.
Little Singers of Armenia (founded in November 6, 1992) is a children's chorus.
 The choir is actively performing in Armenia and abroad.
 It has participated in many international festivals, governmental projects and charity concerts.
 The founder and artistic director of the choir is Tigran Hekekyan.
Counterfactual Quantum Computation is a method of inferring the result of a computation without actually running a quantum computer otherwise capable of actively performing that computation.
The Smith Quartet is a UK based string quartet founded in 1988 that specializes in the performance of contemporary classical music, and is actively performing worldwide and recording as of 2006 .
 They have premiered over 100 works by composers such as Kevin Volans, Graham Fitkin, Michael Nyman, Karl Jenkins, and Sally Beamish.
 They have also collaborated with dance companies and musicians in other genres, notably jazz composer Django Bates and Britpop band Pulp.
 The quartet frequently uses amplification and live electronics in performance to expand their range of performing venues and repertoire.

Question: Which band was actively performing for the longest stretch, Catherine or Sound Team?
Answer: Catherine