Turning 80 is probably not something Cher places much importance on — after all, conventions and expectations have never mattered much to her. Her fearlessness has made her one of the greatest icons in pop music history. Alongside her unique contralto voice, instantly recognizable to generations of listeners, it is above all her versatility and willingness to try new things that have led artists like Lady Gaga and Beyoncé to cite her as an inspiration. The comeback queen In the past six decades, Cher has had several number-one hits across various US Billboard charts. Only the Rolling Stones have managed to accomplish the same feat over such a long period. It all began in 1965 with the classic "I Got You Babe," recorded as a duet with her then-husband Sonny Bono. Most recently, "DJ Play a Christmas Song" reached number one on the Billboard's Adult Contemporary chart at the end of 2023.…