The most important part here is probably that they give access to a room full of instruments, then will use anything that can contribute to a song, even if it's

The most important part here is probably that they give access to a room full of instruments, then will use anything that can contribute to a song, even if it's just two notes alternating on a beat... and get the kids into that before they know anything at all about playing music "properly". This seems like a great way to cultivate a life-long creative understanding of music - "if you can make interesting noise to a beat, that's music, and the rest is just details and practice".