He was an early disciple of René Leibowitz, a teacher and composer who maintained a strict adherence to the dodecaphonic musical theories of Arnold Schoenberg.
His published works, composed between 1944 and 1993, include orchestral, chamber and choral music, operas and songs.
[1][3] Thereafter, according to the Grove Dictionary of Music and Musicians, Casanova's concern was "to ally a romantic spirit with modernity of style".
After his avant-garde period, Casanova returned to what Grove calls "a more classical conception of both style and form".
[2] His Third Symphony (Dithyrambes, 1964) has a vocal part, with words by Nietzsche, taken from Dionysos-Dithyramben set in the original German.