Is it an earthquake or simply a shock? Is it the good turtle soup or merely the mock? Last Friday, Varese Vintage had an unexpected treat for fans of Peter Bogdanovich's cult classic musical comedy with the first-ever CD release of the original RCA Victor soundtrack to At Long Last Love. Bogdanovich, the Oscar-nominated director of films including The Last Picture Show, Paper Moon and What's Up, Doc intended At Long Last Love to pay homage to Hollywood's dazzling musical comedies of the