15 people.

The 60-square-meter music classroom can accommodate 15 people. In addition, each person must have a desk and some musical instruments must be placed around it. Each person takes up an average of four square meters. Sixty divided by four is fifteen.

Music classrooms must first be equipped with a set of music appreciation and expression equipment. Speakers, mixers, power amplifiers, microphones, staff audio-visual boards, and other multimedia-related equipment are essential.