That Puerto Rican rock band Black:Guayaba rest on a foundation of American classic rock is indisputable; the guys cite Aerosmith as a major influence. But give them a listen and Boston will come to mind just as quickly. Throw in a little Layne Staley and Mexican rock giants Mana and you're just about there. This is anthem rock, geared to stadiums and fans with itchy trigger-fingers poised over their lighters. With its squealing guitars and vocals that suggest they wear their pants a bit tight, the band has touched a nerve in the Latin pop world since Lo Demas catapulted them into the charts.