ELECTRIC DIRT (Dirt Farmer Music/ Vanguard Records) is the second album in the last two years from American musical treasure Levon Helm. It's predecessor, the GRAMMY.-winning DIRT FARMER, his first solo LP in a quarter century, followed Levons near-miraculous recovery from throat cancer, and as such represented a new lease on life for the legendary artist, who rose to prominence as the drummer and vocalist for Levon and the Hawks, which later became the Band. Electric Dirt again finds Levon stee