Place this at the very start of a school sequence before any dialogue begins, then follow it with a short bell ding sound effect to mark a single answer or desk action, keeping classroom ambience underneath for the rest of the scene.
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This clip is the full clear electronic chime heard in Japanese schools, a bright repeating melody that rings for about twenty four seconds instead of a single strike. It feels calm, orderly and a little nostalgic, instantly putting listeners in a busy hallway between lessons. In Japan it marks the start and end of classes, breaks and the school day.