Researcher : The pieces likely composed by Mozart before he could write music . Mozart 's father probably transcribed the music , he says . Compositions have long been known but as anonymous compositions . Pieces were in manuscript form by Mozart 's father .
Researcher : Two pieces likely composed by Mozart before he could write music . Mozart 's father probably transcribed the music , researcher says . Compositions have long been known but as anonymous works . Pieces were in book compiled by Mozart 's father .