It was her last dance today. Donna Summer, 5-time Grammy winner who shot to superstardom in the ’70s with iconic hits including Last Dance, Hot Stuff and Bad Girls, died in her Florida home from her long battle with lung cancer. While tears are shed and records are played in commemoration to her legacy, one can help but wonder what the revenue is behind music sales after a celebrity’s passing. When Amy Winehouse passed away, there was an incredible flux of record sales. After the confirmation of her death and the closure of the charts, Winehouse’s second studio album made a return to the charts,…