Original: However , Morley evidently spent some time away from East Anglia , for he later referred to the great Elizabethan composer of sacred music , William Byrd , as his teacher ; while the dates he studied with Byrd are not known , they were most likely in the early 1570s .
Simplified: He studied the madrigals by Italian composers and created the tradition of the English madrigal , a tradition that became extremely popular , but which only lasted about 30 years .