Complex sentence: Songs are usually short, contain ostinatos, are within singing range, can be manipulated to be played in a round or ABA form, and can be anything from nursery rhymes to songs that are invented by the children themselves.
Split into simpler sentences: Songs are usually short, contain ostinatos, are within singing range, can be manipulated to be played in a round or ABA form. Music is usually and can be anything from nursery rhymes to songs that are invented by the children themselves.