from SportsNet.ca/mlb.com…CLICK HERE Willie Mays is turning 90, and no mistaking that number. It strikes with the clarity of a line drive. Mays played in a sport measured by milestones — 3,000 hits, 500 homers, signposts he passed and then some — and now here’s one more. On Thursday/Today, when baseball’s oldest living Hall of Famer is serenaded with renditions of “Happy Birthday to You,” it might be time to expand the playlist. A player of such infinite variety deserves as much. There’s plenty to choose from. References to the Giants center fielder cut across the years and the genres…