Question:  Temptations Live! features an American baritone singer nicknamed what?

Context paragraphs:
Louis Otey: Louis Otey (born 22 November 1954) is an American baritone singer born in South Dakota.  He performed at the Royal Opera House Covent Garden, Metropolitan Opera, San Francisco Opera and other major international companies.

Otis Williams: Otis Williams (born Otis Miles Jr.; October 30, 1941) is an American baritone singer.  Nicknamed "Big Daddy", he is occasionally also a songwriter and a record producer.  Williams is best known as the founder and last original surviving member of the Motown vocal group The Temptations, a group in which he continues to perform.  He also owns the rights to the Temptations name.

Gus Wickie: August Wicke (May 7, 1885 － January 3, 1947), also known as "Gus Wicke" and "Gus Wickie", was a German-born American baritone singer, and stage and voice actor.

Paul Williams (The Temptations): Paul Williams (July 2, 1939 – August 17, 1973) was an American baritone singer and choreographer.  Williams was noted for being one of the founding members and original lead singer of the Motown group The Temptations.  Along with David Ruffin, Otis Williams , and fellow Alabamians Eddie Kendricks and Melvin Franklin, Williams was a member of The Temptations during the "Classic Five" period.  Personal problems and failing health forced Williams to retire in 1971.  He was found dead two years later as the result of an apparent suicide.

Temptations Live!: Temptations Live!  was the first live album to be released by The Temptations.  Recorded on October 3, 1966 in the Upper Deck of the Roostertail Club in Detroit, Michigan, and released on album by Gordy (Motown) Records in 1967, the album features David Ruffin, Paul Williams, Eddie Kendricks, Melvin Franklin, and Otis Williams performing their regular live repertoire for a highly receptive crowd mostly consisting of young women.  Included in the set are Temptations hits such as "My Girl", "My Baby", "Get Ready", "Ain't Too Proud to Beg", "Don't Look Back", and the group's then-current single, "Beauty Is Only Skin Deep".  Out of the several live albums the group recorded during their career, this is the only one to feature David Ruffin.  The album remained on the Billboard 200 album chart for 51 weeks peaking at number 10.

Art Lund: Art Lund (April 1, 1915 in Salt Lake City, Utah – May 31, 1990 in Holladay, Utah) was an American baritone singer, initially with bandleaders Benny Goodman and Harry James, and was also a television and stage actor.

Ralph Cato: Ralph Cato is an American baritone singer.  Cato performs opera, oratorio, and musical theatre.  He performs internationally, and currently serves as, a faculty member at University of California, Riverside teaching vocal studies.

Charles W. Clark: Charles William Clark (15 October 1865 – 4 August 1925) was an American baritone singer and vocalist teacher.  He is generally regarded as the first American baritone singer to be famous in Europe, and as one of the greatest baritone singers of all time.  He sang to great acclaim at the major opera houses of Europe and America, appearing in a wide variety of roles from the Italian, French and German repertoires that ranged from the lyric to the dramatic.

Vaughn Monroe: Vaughn Wilton Monroe (October 7, 1911 – May 21, 1973) was an American baritone singer, trumpeter, big band leader, actor, and businessman, most popular in the 1940s and 1950s.  He has two stars on the Hollywood Walk of Fame; for recording and radio.

J. Harold Murray: J. Harold Murray (February 17, 1891 – December 11, 1940) was an American baritone singer and actor.  For more than a decade, during the Roaring Twenties and the Depression Thirties, he contributed to the development of musical theater by bridging vaudeville, operetta and the modern American musical.  The most popular American songs he introduced on Broadway included "Autumn in New York" (1934, "Thumbs Up! ", words and music by Vernon Duke); "Let's Have Another Cup of Coffee" and "Soft Lights and Sweet Music" (1932, "Face the Music", Moss Hart and Irving Berlin); "Rio Rita", "The Kinkajou" and "The Rangers Song" (1927, "Rio Rita", Harry Tierney and Joseph McCarthy); and "Mandalay" (1921, "The Whirl of New York", (Gustave Kerker, Hugh Morton and Edgar Smith).

Supporting paragraphs: Temptations Live! Otis Williams
Answer: Big Daddy