Vocalist Petra Magoni, and bassist Ferruccio Spinetti form the unique duo Musica Nuda, or “Naked Music.” They will present two concerts at Spoleto on May 21 and 22 at the College of Charleston that will demonstrate an amazing repertoire that encompasses jazz, rock, classical and more. Ms. Magoni talks about how the duo was formed and why it feels no limits on what it can perform even with its minimal instrumentation.