The Main Event is a video, released in 1999, of a tour The Main Event Tour by singers Olivia Newton-John, John Farnham and Anthony Warlow.
Norman Yemm (23 March 19333 February 2015) was an Australian actor, opera singer, musical theatre performer and sportsman.
 He had spent many years as a chief baritone with the Australian Opera appearing in such roles as Don Pasquale and was a frequent performer in the musical theatre world - most notably as Curly in "Oklahoma!
", and the Pirate King in "The Pirates of Penzance".
 He also appeared in South Pacific and The Sound of Music, prior to his television roles.
 As a sportsman Yemm was a professional runner for many years and an AFL footballer.
Nelson Ackerman Eddy (June 29, 1901 – March 6, 1967) was an American singer and actor who appeared in 19 musical films during the 1930s and 1940s, as well as in opera and on the concert stage, radio, television, and in nightclubs.
 A classically trained baritone, he is best remembered for the eight films in which he costarred with soprano Jeanette MacDonald.
 He was one of the first "crossover" stars, a superstar appealing both to shrieking bobby soxers and opera purists, and in his heyday, he was the highest paid singer in the world.
Michael Chioldi (born May 24, 1970) is an American operatic baritone who has performed at many major American opera houses and festivals, including the Metropolitan Opera, San Francisco Opera, Washington National Opera, Houston Grand Opera, San Diego Opera, Santa Fe Opera, Los Angeles Opera, Palm Beach Opera, Long Beach Opera, Minnesota Opera, Spoleto Festival USA, Arizona Opera, Utah Opera, New York City Opera, Fort Worth Opera, Chautauqua Opera, Kentucky Opera, Glimmerglass Opera, Hawaii Opera Theatre, Santa Fe Concert Association, Lyric Opera of Kansas City, Chicago Opera Theatre, Austin Lyric Opera, New Orleans Opera, Odyssey Opera, Michigan Opera Theatre and Vermont Opera Project.
A baritone is a type of classical male singing voice whose vocal range lies between the bass and the tenor voice types.
 It is the most common male voice.
 Originally from the Greek βαρύτονος ("barýtonos") , meaning "deep (or heavy) sounding", music for this voice is typically written in the range from the second F below middle C to the F above middle C (i.e. F–F) in choral music, and from the second A below middle C to the A above middle C (A to A) in operatic music, but can be extended at either end.
 The baritone voice type is generally divided into the baryton-Martin baritone (light baritone), lyric baritone, "Kavalierbariton", Verdi baritone, dramatic baritone, "baryton-noble" baritone, and the bass-baritone.
Cole Albert Porter (June 9, 1891 – October 15, 1964) was an American composer and songwriter.
 Born to a wealthy family in Indiana, he defied the wishes of his domineering grandfather and took up music as a profession.
 Classically trained, he was drawn towards musical theatre.
 After a slow start, he began to achieve success in the 1920s, and by the 1930s he was one of the major songwriters for the Broadway musical stage.
 Unlike many successful Broadway composers, Porter wrote the lyrics, as well as the music, for his songs.
Suzan Erens (born November 11, 1976 in Heerlen, Netherlands) is a Dutch concert singer.
 Classically trained, her concert repertoire includes arias from opera and operetta as well as musical theatre and pop songs.
 She has toured worldwide and recorded as a soloist with André Rieu's Johann Strauss Orchestra.
Frank Guarrera (December 3, 1923 – November 23, 2007) was an Italian-American lyric baritone who enjoyed a long and distinguished career at the Metropolitan Opera, singing with the company for a total of 680 performances.
 He performed 35 different roles at the Met, mostly from the Italian and French repertories, from 1948 through 1976.
 His most frequent assignments at the house were as Escamillo in Georges Bizet's "Carmen", Marcello in Giacomo Puccini's "La Bohème", Valentin in Charles Gounod's "Faust", and Ping in Puccini's "Turandot".
 He was also an admired interpreter of Mozart roles, establishing himself in the parts of both Guglielmo and Don Alfonso in "Così fan tutte" and Count Almaviva in "Le nozze di Figaro".
 Most of the roles he portrayed were from the lyric repertoire, such as the title role in Tchaikovsky's "Eugene Onegin", but he also sang some heavier roles at the Met like Amonasro in "Aïda", Jack Rance in "La fanciulla del West" and Il conte di Luna in "Il trovatore".
Anthony Thorne Warlow {'1': ", '2': ", '3': ", '4': "} (born 18 November 1961 in Wollongong, New South Wales, Australia) is an Australian opera and musical theatre performer, noted for his character acting and considerable vocal range.
 He is a classically trained lyric baritone.
Rhydian James Roberts (born 14 February 1983), known mononymously as Rhydian, is a classically trained Welsh baritone singer, television presenter and musical theatre actor.

Question: Which Australian opera and musical theatre performer classically trained lyric baritone was featured in the video "The Main Event?"
Answer: Anthony Warlow