Mr. Calmès maintains an active schedule as a guest soloist with numerous choruses, orchestras, and other ensembles. He excels in the interpretation of great oratorios such as Handel’s Messiah, Haydn’s Creation and Mendelssohn’s Elijah; concert works such as Beethoven’s Missa Solemnis, Symphony No. 9, and Mahler’s Das Lied von der Erde; and an extensive repertoire of both well-known and rare works encompassing Monteverdi, Mozart, and contemporary masters. He is also in demand as a recitalist, appearing on many concert series and music festivals in the United States, and has been featured on National Public Radio.

He made his European debut in the Bach Magnificat at the Rijeka Festival (Yugoslavia) and Venice in 1985, and has since made concert tours of Austria, Belgium, China, England, France, Germany, Italy, and The Netherlands. 1988 saw his solo debut in Paris at La Madeleine with James David Christie, Boston Symphony Orchestra organist, presenting the world premiere of "Marian Antiphons," the first of several song cycles written for and dedicated to Mr. Calmès by celebrated American composer Daniel Pinkham. In 1995, they toured Germany where Mr. Calmès was the only classical singer invited to participate in the international music festival Nachbar Amerika. This followed performances in London, Austria, Rome, and Washington DC. In 1996, he was invited to China under the auspices of the Shanghai Office of Cultural Affairs, giving solo recitals in Beijing, Kunming, and Shanghai. He returned to England in May 2000 for concerts in London, Oxford and Cambridge.