IT AIN’T NOTHIN’ BUT THE BLUES—a terrifically entertaining revue which traces the history of the blues from its origins in Africa through the American South to all points beyond—has been cheered at theaters around the country as it made its way to New York. This show was a sold-out hit during its brief run at the New Victory Theater and the audience and critical acclaim it received made it clear this remarkable new show deserved to be enjoyed by a much larger group of New York theatergoers.