Neil Diamond, who turns 77 on Wednesday, has announced his retirement from touring after revealing on his website Monday that he has been diagnosed with Parkinson's disease. The Rock and Roll Hall of Fame inducted singer-songwriter and musician has canceled the remaining dates of his 50th anniversary tour, which was set to take him through Australia and New Zealand in March. “It is with great reluctance and disappointment that I announce my retirement from concert touring,” Diamond said in a statement.