by William RuhlmannYou might have thought the Blasters had been in suspended animation for 25 years when their major-label debut turned up in late 1981 sounding for all the world like something cut in the Sun Studios in Memphis in 1956. Dave Alvin knew all the licks and his brother Phil had the R&B/country wail down. Best of all, you couldn't tell the oldies from Dave's newly written classics. Welcome to the birth of rock & roll, all over again.