More than anything else, I think Pino Donaggio’s score sets Piranha apart. Initially, anyway. The film’s a very self-aware Roger Corman Jaws “homage,” but Donaggio’s score very quickly establishes it on firm ground. The score’s delicate, without any spoof-related cynicism (there’s no attempt to mimic the famous Jaws theme, Donaggio has some piranha attack music,…