An instrument-petting zoo is featured at an event promoting Tucson's many musical resources for all ages, from 1:30 to 4:30 p.m., Saturday, May 12; free. Music students are invited to bring their instruments and take part in mini-master-classes. Participants also may create homemade instruments, experiment with composition and found sounds, attend music and movement classes, experience live musical performances and win door prizes. Refreshments are provided.