Modern research has confirmed that Seville’s most illustrious composer, in his time the most famous in Spain, was born on October 4—the day of St Francis—in 1528. He died a month after his seventy-first birthday. As for his forty-four years of service to the cathedral, we must qualify those too. The memorials must refer to Guerrero’s twenty years of official appointment as “chapelmaster-in-waiting” and the almost twenty-five years of his holding the full title of maestro de capilla. In fact, he had served as a choirboy, possibly from 1538, then as a youthful singer from 1542, developing what was later described as escogida voz de contra alto (a tenor-altino voice of choice quality). He may have had composition lessons from Morales during 1545 or 1546, but it is disputed whether these took place in Toledo or in Seville (which Morales may have visited then). In 1590, Guerrero described himself as having been taught by his elder brother Pedro and then by Morales.