Bertrand Gröger founded the Jazzchor Freiburg in 1990. In addition to awards at competitions (including first prize at the German Choir Competition in 1998 and first prize at the Choir Olympics in Korea 2002), the Jazzchor's international fame is the result of tours and concerts in Japan, Korea, Russia, Germany, France, the Czech Republic, Poland, Italy, Austria, Switzerland, and Denmark, two CDs ("Hammenoma" and "Live in Japan"), and radio and TV appearances.

The Jazzchor has played at festivals (such as the "International Jazz Vocal Festival Russia", "Montreux Jazz Festival", and the "Rheingau-Musik-Festival"), in concert halls (including "Sunflower Hall", Yokohama; "Cappella", St. Petersburg; and "Palais de la Musique", Strasbourg), in churches (Monastery Church, Zlatá Koruna; "Christianskirken", Århus; and Magdeburg Cathedral), and in jazz clubs ("Sweet Basil Club", Tokyo; "Jazz Art Club", Moscow; and "Stadtgarten", Cologne).

The Jazzchor's repertoire consists of vocal jazz from swing to fusion; the Choir also aims to bridge the gap between art and entertainment. Gröger writes most of the arrangements, and scat arrangements, collective rap, and shout choruses give a whole new twist to pieces by Miles Davis, John Coltrane and Nat King Cole - to name just a few of the greats covered. The Jazzchor also gives a choral sound to the 4-6 voice arrangements of such vocal groups as Manhattan Transfer and the New York Voices.

In addition to a few a-cappella pieces, a combo consisting of piano, double bass, and drums accompanies the Jazzchor. Occasionally, guest soloists join this lineup on saxophone, vocals, or tap dancing. To date, the guests have included the Swingle Singers, Bernd Schlott, Torun Eriksen, Cécile Verny, Norbert Gottschalk, and Tap for Two.

In addition to vocal jazz, there have been projects with Bobby McFerrin ("Circlesongs"), the Bamberg Symphonic Orchestra ("der und die (das)" by Bertrand Gröger), the Philharmonic Orchestra of Freiburg (Maurice Ravel's "Daphnis & Chloë" and L. Bernstein's „Mass” under the direction of Karen Kamensek), Basel Sinfonietta (George Gershwin's "Porgy & Bess") and the Hanover Big Band (Duke Ellington's "Concert of Sacred Music").