By the late 1990s, Addison decided to concentrate on cello music from the 20th and 21st centuries, and was soon performing many works among which Dutch and Australian composers were well represented.
By the late 1990s, Addison decided to focus on chamber music and solo playing. The performance of contemporary music is a special interest of Addison's and he has built up a substantial repertoire of works among which Dutch and Australian composers are well represented.