Madonna is so sick of singing her '80s classics Holiday and LIKE A VIRGIN, it would take a rich Russian "with $30 million" to tempt her to perform the songs again. The 49-year-old singer is rumoured to be heading out on tour this year (08) to promote her new album Hard Candy, which hits stores on 29 April (08). And Madonna is already warning fans she won't be revisiting her old classics. In an interview with New York radio station Z-100 FM, due to air on Friday (28Mar08), the Material Girl says, "I'm not sure I can sing Holiday or Like A Virgin ever again. "I just can't - unless somebody paid me like $30 million or something. (Like if) some Russian guy wants me to come to the wedding he's going to have to a 17-year-old."