Trained music therapists helped each participant to improvise music using percussion instruments and drums.
Gamelan is Indonesia's traditional folk music, its striking feature is using percussion instrument as the main part, orchestral musical instrument just being in additional position.
In an orchestra, people who play percussion instruments sit at the back.
For example, it makes percussion instruments out of general household items like pots, pans, and plastic hoses.
The drummer in my band plays many percussion instruments including a gong and a cow bell.