The gamelan is an ensemble of musicians in parts of Indonesia. It mostly consists of round copper gongs in various sizes, each tuned to a different note. Most of the instruments are percussion instruments. It is still used for traditional ceremonies, but is not that popular anymore.
The Tropenmuseum here in Amsterdam has a beautiful set of instruments. It has been put in storage since 2007, but it used to be on prominent display, to be played on Sundays. I remember seeing that as a kid, with my older sister. Because of that memory, I bought this record.
Reading that those beautiful instruments are now put in storage makes me a bit sad. Hearing them played in the museum was always a treat, and they belong there, to be played regularly.