Simplify the following text for a Grade 7 native English-speaking person.
Original: 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 .
Simplified: 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 .