The development of Cathedral, one of the first interactive works of music and art on the World Wide Web; the development of new virtual instruments, such as the PitchWeb, that allow listeners to participate actively and creatively; and the possibility that a new form of music is emerging are discussed. This new music, Virtual Music, is a new art form, within a new medium, producing a new type of interactive artistic experience, with the ability to draw in and engage its listeners in the creative process.