Tadeusz Wielecki was born in Warsaw in 1954. He studied the double-bass and composition (with Włodzimierz Kotoński) at the Academy of Music in Warsaw. Thanks to a Witold Lutosławski grant, he continued his compositional studies abroad, with Isang Yun in West Berlin and Klaus Huber in Freiburg (1986-87).
His text-sound composition A Very True Story won the top prize at the ear '95 Radio Competition of Electroacoustic Music in Budapest. His Concerto ˆ rebours for violin and orchestra received a recommendation at the unesco International Composer's Rostrum in Paris (1999). As a double-bass player he has performed in many European countries and the United States. The promotion of modern music is another important area of his activity. He has introduced several series of radio features (on Polish Radio 2, 3 and Radio bis) addressed specifically to children and young people: Hits of Contemporary Music', Something out of Nothing' and Charming Sounds'. He also collaborated with the Centre for Children's Art in Poznań.
He was Artistic Director of the iscm World Music Days in Warsaw in 1992. He collaborates with the Okopowa' Cultural Centre in Warsaw.
Since 1999 he has served as Director of the Warsaw Autumn' International Festival of Contemporary Music.