NICK KREWEN Mike Oldfield, the British composer of Tubular Bells, the chart-topping 1973 instrumental album that revolutionized rock music and represented progressive rock at its most indulgent, sees future music entertainment as “a Salvadore Dali painting you can walk into.” Limited copies of his new album, Songs Of Distant Earth, contain a multi-media CD-ROM that he assembled midway through recording sessions, and Oldfield says he’s excited by new computer technology. “I…