The choir of c. 140 voices is mainly concerned with the musical part in services at the cathedral. The singers are trained in three weekly rehearsals in the Chorhaus near the cathedral. Every year, a small group of new singers is educated to join the choir. The repertoire consists of church music by Johann Sebastian Bach, Joseph Haydn, Wolfgang Amadeus Mozart, Ludwig van Beethoven, Franz Schubert and Anton Bruckner.
The choir has toured several countries in concert, including Italy, France, Belgium, Switzerland, Israel, Russia, the US, Canada and Brazil. They made several recordings, representing the repertoire.
Gesänge zum Fest des Hl. Martinus: Hymnus "Fratres unanimes", Antiphon "O beatum pontificem". Choralschola des Mainzer Domchores (conductor: Horst Willi Groß), in: Horst Willi Groß und Heinrich Hain: Choralschola des Mainzer Domchores. Glocken des Mainzer Domes. Seite A, Tonstudio Orgelbau-Vleugels GmbH (= OV 42), Hardheim-Rügental 1976[1]
Musica Sacra im Hohen Dom zu Mainz. Mainzer Domchor (Conductor: Heinrich Hain), Mainzer Dommusik (conductor: Heino Schneider), Pallas-Verlag, Diepholz
Wilhelm Petersen: Grosse Messe für 4 Solostimmen, Chor, Orchester und Orgel op. 27, Wergo-Schallplatten, Mainz, 1992
Lobet den Herren – geistliche Chöre und festliche Klänge, BMG Ariola Hamburg, München, 1999
Sanctus, BMG Ariola Hamburg, München, 1999
Carl Orff: Carmina burana, Hr-Media, Frankfurt (Main), 2003