Have you noticed that when a renowned musician dies, sales of his or her songs/albums go through the roof in the weeks that follow? That's precisely the case with Prince, the mega-successful singer, songwriter, and music producer who died at the age of 57 on April 21. According to Nielsen Music, Prince’s albums and songs (including song downloads) have sold over 4 million copies in the U.S. since his untimely passing. Just to put that massive number into perspective, Prince’s music sold comparably little the week prior to his death: just 5,000 albums and 14,000 song downloads in the week ending April 15. We saw a similar phenomenon play out when Michael Jackson died in 2009 and James Brown passed away in 2006. So why do people do this? For starters, they're big fans of the person's music and do it as a way of honoring his or her life. Now that the individual is gone, they can no longer look forward to seeing them live in concert or at awards shows on TV. They ...