Moody Blues drummer...by Jeff Niesel...For more than 40 years, the Moody Blues have soldiered on as progressive-rock giants, unfazed that the world has moved beyond the type of high-minded art-rock they pioneered in the late '60s and early '70s. But nostalgia for classic rock doesn't die easily. The band is now touring behind the DVD release of Live at the Isle of Wight, which features footage from the group's appearance at the 1970 festival. Moody Blues drummer Graeme Edge spoke about the band's legacy.…