Busnois may have been the composer of the famous tune L'homme armÃ , one of the most popular tunes of the Renaissance . The tune was often used as a cantus firmus for mass composition . According to Pietro Aron , Busnois may have been the composer of the famous tune L'homme armÃ , one of the most widely distributed melodies of the Renaissance , and the one more often used than any other as a cantus firmus for mass composition .