Original: According to Pietro Aron, Busnois may have been the composer of the famous tune L'homme armé, 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.
Simplified: Busnois may have been the composer of the famous tune L'homme armé, one of the most popular tunes of the Renaissance. The tune was often used as a cantus firmus for mass composition.