Rock 'N' Roll It, Mambo, Stroll It is Ace's second excursion into the Music City Vocal Group category with the focus on the uptempo side of the genre. Music City doo wop, and groups from the San Francisco Bay Area in general, are known for a bluesier, rougher-hewn tenor; a ''street'' sound which accurately reflects the tastes of the local black community of the mid-1950s.............