Question: How many acts were in the music drama in which Heinz Zednik played David?

Context articles: Budgie (band)
The Great Escape (festival)
Pleasantville Music Festival
Bay City Rollers
Music on The O.C.
Acid jazz
Heinz Zednik
Budapest Opera Ball
Die Meistersinger von Nürnberg
Steve Thompson (songwriter)

Budgie are a Welsh hard rock band from Cardiff.
 They are described by author Garry Sharpe-Young as one of the earliest heavy metal bands and a seminal influence to many acts of that scene, with fast, heavy rock (an influence on the new wave of British heavy metal (NWOBHM) and acts such as Metallica) being played as early as 1971.
 The band has been noted as "among the heaviest metal of its day".
The Great Escape was a music festival held at Newington Armory, located within Sydney Olympic Park that took place in 2006 and 2007.
 Initially held over the Easter long weekend for the first two events, in 2008 it was announced the festival would take place on the Labour Day weekend, however the event was cancelled 2 months from the date due to poor ticket sales .
 It evolved from the 2005 Cockatoo Island Music Festival.
 The music and other attractions run over three full days (Good Friday to Easter Sunday in 2006–07), with some patrons camping from Thursday evening to Monday morning.
 Punters could attend either for the full weekend camping, purchase a 3-day pass and commute each day or attend a single day.
 Many acts also played the East Coast Blues & Roots Music Festival the same weekend, however The Great Escape line-up is more diverse featuring pop, hip hop, electronic and rock acts that would not fit into a Blues and Roots line-up.
 In addition to musical acts, there is also a wide range of other features such as comedy acts, bingo and trivia, conspiracy theory talks and yoga.
 There is no immediate future for the Great Escape at this point, but organisers are confident it will be resurrected in the near future.
The Pleasantville Music Festival is a single-day music festival which takes place annually at Parkway Field in Pleasantville, New York.
 Some of the many acts that have performed at the Pleasantville Music Festival are: Guster, Gin Blossoms, Jakob Dylan, Joan Osborne, Marc Cohn, Big Head Todd & the Monsters, the English Beat, and Roger McGuinn.
 These major acts perform alongside up and coming national acts and small local bands from around the tri-state area.
The Bay City Rollers are a Scottish pop band whose popularity was highest in the mid 1970s.
 The "British Hit Singles & Albums" noted they were "tartan teen sensations from Edinburgh", and were "the first of many acts heralded as the 'biggest group since the Beatles' and one of the most screamed-at teeny-bopper acts of the 1970s".
 For a relatively brief, but fervent period (nicknamed "Rollermania"), they were worldwide teen idols.
 The group's line-up had numerous changes over the years, but the classic line-up during its heyday included; guitarists Eric Faulkner and Stuart John Wood, singer Les McKeown, bassist Alan Longmuir, and drummer Derek Longmuir.
The use of music on FOX drama "The O.C." gained much acclaim.
 Show creator Josh Schwartz wanted music to be a "character on the show" and the experienced Alexandra Patsavas took the role of music supervisor.
 The show's orchestral music was composed by Christopher Tyng.
 The series is credited with showcasing many artists, and helping to elevate them in the music business.
 Many acts made guest appearances on the show, and others premiered their new singles in episodes.
 Six official soundtracks were released, and these were compilations of predominantly indie music.
Acid jazz, also known as club jazz, is a musical genre that combines elements of jazz, soul, funk, and disco.
 Acid jazz originated in the London club scene of the mid-1980s in the rare groove movement and spread to the US, Japan, Eastern Europe, and Brazil.
 Major acts included Brand New Heavies, Incognito, Us3, and Jamiroquai from the UK and Buckshot LeFonque and Digable Planets from the US.
 The rise of electronic club music in the mid to late 1990s led to a decline in interest, and in the twenty-first century, the movement became indistinct as a genre.
 Many acts that might have been defined as acid jazz are now seen as jazz-funk, neo soul, or jazz rap.
Heinz Zednik (born February 21, 1940) is an Austrian operatic tenor, closely associated with the character tenor roles of Wagner such as Mime and Loge ("Der Ring des Nibelungen") and David ("Die Meistersinger von Nürnberg").
 He is also distinguished in roles such as Valzacchi ("Der Rosenkavalier"), Monostatos ("The Magic Flute"), Pedrillo ("Die Entführung aus dem Serail"), the Scribe ("Khovanshchina"), the Captain in "Wozzeck", and the Director (Luciano Berio's "Un re in ascolto").
The Budapest Opera Ball ("Budapesti Operabál" in Hungarian, "Budapester Opernball" in German) is an annual Hungarian society event taking place in the building of the Budapest Opera ("Operaház") on the last Saturday of the carnival season, usually late February.
 On this occasion the stage and the auditorium of the Opera is transformed into a huge ballroom.
 The dress code is evening dress: white tie and tails for men; floor-length gowns for women.
 The ball is opened by more than a hundred debutante dancers after a show consisting of selected arias, followed by the 'Alles Walzer' with people dancing until dawn.
 Recent star guests include Montserrat Caballé, Ornella Muti, Yevgeny Nesterenko, Walter Berry, Heinz Zednik, Katia Ricciarelli, Patrizio Buanne, Catherine Deneuve, Katarina Witt, Gina Lollobrigida, Daryl Hannah and Guy de Rothschild.
 Besides international guests, the balls are highlighted by the most well known Hungarian opera singers.
Die Meistersinger von Nürnberg (] ; "The Master-Singers of Nuremberg") is a music drama (or opera) in three acts, written and composed by Richard Wagner.
 It is among the longest operas commonly performed, usually taking around four and a half hours.
 It was first performed at the Königliches Hof- und National-Theater, today the home of the Bavarian State Opera, in Munich, on 21 June 1868.
 The conductor at the premiere was Hans von Bülow.
Steve Thompson (born 24 April 1952) is a British songwriter and record producer who is responsible for a number of single and album chart hits and well known songs recorded by international recording artists.
 He was instrumental in setting up the influential Neat Records.
 He was particularly active as a producer during (as well as being partially responsible for), the NWOBHM years (New Wave of British Heavy Metal) During this time he produced many acts and kick-started the careers of several influential heavy metal acts including the first recordings of Newcastle band Venom ( who are widely credited with the invention of black metal) and Raven who have been credited with being hugely influential by Metallica.