The late pop star Prince was known in life as an artist fiercely protective of his intellectual property, but how much others may profit from his legacy, including a large body of unreleased songs, hinges on how astute he was in arranging for control of his music after death.

Questions about Prince's estate loomed Friday, a day after his unexpected death at age 57. Sales of the iconic performer's albums surged, and platforms from satellite radio Sirius XM to MTV rushed to satisfy a sudden fascination with his music.

Some 230,000 albums and 1 million singles from Prince's catalog were sold in the United States alone on the day he died, according to BuzzAngle Music, which tracks daily music sales.