While I was browsing the subreddit (which also functions as a support group) /r/Brewers, for the Milwaukee Brewers, who are currently 19.5 games behind the St. Louis Cardinals, one of the San Francisco Giants fans praised Milwaukee’s organ player. The Brewers hired the current organ player (who plays all his music live, not recorded!) out of high school (Racine’s St. Catherine!), and he’s been working there for twelve seasons now.
You can read a little bit about the Miller Park organ in this Scripps/620WTMJ article, where you’ll learn a little bit of the history of the organ at Miller Park.
You can also read an interview with Mr. Dean Rosko, and learn more about being the organist for a Catholic church (sadly in Illinois), a local restaurant, a Major League Baseball team, and the Oriental Theatre.