CARACAS, Venezuela (AP) — In the front row of the audience, an elderly man wrapped in a heavy coat listens intently to a youth choir, then stands and applauds enthusiastically.

Noa Kageyama is in the business of bulletproofing, but his work does not involve Kevlar vests or polycarbonate. The performance psychologist runs a consultancy, ProMind Coaching, whose clients include Olympic athletes and CEOs. His mentor and business partner, Don Greene, is a former champion diver and Green Beret, whose specialties including teaching principles of sports psychology to SWAT team members. But the battlefield Mr. Kageyama is most interested in is the music world. On his blog, The Bulletproof Musician, he takes principles developed to toughen up tennis pros and uses them to help musicians cope with the intense pressure of solo performance. Last month, he joined the faculty of the Juilliard School.