Carl began studying voice in 1975 and went back to Juilliard a year later at age 26 as a singer in their American Opera Center (AOC) professional program. He studied with Nina Hinson, Raymond Buckingham, Dan Merriman, Armen Boyajian, Robin M. Williams, and briefly with
Richard Torigi while at the AOC, which ended after just a few lessons when he told Carl, "You have a very ugly voice and should quit." He spent three summers at the Aspen Music Festival, where he sang in his first opera and made his solo debut as the Basso Profundo soloist in the world premiere of
Krzysztof Penderecki's
Utrenja II for Five Soloists, Boy's Choir, Chorus, and Orchestra. After a summer apprenticeship at the
Central City Opera in Central City, Colorado in 1978, Carl joined the
New York City Opera at age 28 for four seasons, where he sang as chorister and made his solo debut there in the dual roles of Alcindoro and Benoît in
La Bohème. For several years afterward, he continued to sing with orchestras such as the Juilliard Orchestra, the New York Philharmonic, and the
American Symphony Orchestra; with many small ensembles such as Vocal Jazz, Inc., the Cathedral Singers at the
Cathedral of St. John the Divine, and the New York Choral Soloists; in regional opera playing roles such as Méphistophélès in
Faust, Sarastro in
Die Zauberflöte, Zaccaria in
Nabucco,
Seneca in
L'incoronazione di Poppea, and Theseus in
A Midsummer Night's Dream; and did musical and regional theater.
Rockapella In the spring of 1988, while sitting in the Pier 72 Diner on 72nd Street and West End Avenue in New York City, Carl read an ad for a bass in an
a cappella group called
Rockapella in
Backstage. He answered the ad and auditioned for
Sean Altman and Elliott Kerman, but did not hear back from them for two months. That summer, while Carl worked with the
Minnesota Opera, Altman and Kerman asked him to be in the group and sent him a stack of music to learn. Upon receiving and looking over the music, Carl decided he didn't want to sing
barbershop tunes and Christmas songs, so he sent the music back and told the pair he had changed his mind about taking the position. He also appeared on movie soundtracks as an ensemble singer for such films as
Corpse Bride and
Nine; in 2007 he appeared in the independent movie
The Wedding Weekend as a tough guy in prison who likes to sing. In the fall of 2009, Carl filmed a scene for the
Will Ferrell movie
The Other Guys, released on August 6, 2010, in which he is an a cappella singer in a bar. Since 2008 Carl has gotten back together with Steve Keyes, Kerman, and Altman on three occasions, billing themselves as XRP. This regrouping of the 1988–1991 line up of Rockapella was originally scheduled to occur only twice: once as a practice gig on July 26, 2008, and a second time at the 2008 A Cappellastock in Ogden, Utah on August 23. However, XRP got together for a third show on April 17, 2009, and sang a song written by Carl and Altman on the
Schoolhouse Rock!: Earth Rock soundtrack called "You Oughta Be Savin' Water"; Carl is also one of the singers on another Altman song on the same album titled "Save the Ocean". In addition to singing with old friends at various gigs, Carl sings in a pro chorus with the New York Philharmonic and the American Symphony Orchestra from time to time, and every now and then concertizes with Rockland Vocal Arts, a small ensemble of singers. Carl also privately teaches a limited number of vocal students and coaches vocal groups. ==Voice-over artist==