As a singer, he is most active in concert, including historically informed performances in works such as Monteverdi's Vespro della Beata Vergine and Handel's Messiah.
Born in Speyer,[1] Kelly began his musical education with piano lessons from age 6, followed by instructions in organ playing, harmony and Tonsatz.
[5] On 3 October 2021, he sang the tenor solo in Rossini's Petite messe solennelle of Chor von St. Bonifatius in Wiesbaden, conducted by Roman Twardy.
[2] In 2019, Kelly was a soloist in a recording of Franz Ignaz Beck's opera L'isle déserte, performed by La Stagione Frankfurt conducted by Michael Schneider.
[7] He was the tenor soloist in a recording of Mozart's Requiem with the Gutenberg-Kammerchor and the Neumeyer Consort, conducted by Felix Koch [de], with soprano Chisa Tanigaki, alto Rebekka Stolz, and bass Christian Wagner.