On Monday night, Neil Diamond announced that he has been diagnosed with Parkinson's disease and is retiring from touring, starting with the third leg of his 50th Anniversary tour in March. "It is with great reluctance and disappointment that I announce my retirement from concert touring," Diamond said in a statement, going on to thank his fans with a shout-out to his most famous song, "Sweet Caroline." "My thanks goes out to my loyal and devoted audiences around the world.