{"type":"rich","version":"1.0","title":"音楽の記号の意味","description":"音楽の強弱記号と速度記号の意味","author_name":"Padlet Arcade","thumbnail_url":"https://arcade.padlet.com/open-graph/social-preview-image.png?timestamp=1784084720251&hashid=Rej9kLomKd","html":"<iframe src=\"https://arcade.padlet.com/embed/Rej9kLomKd\" width=\"720\" height=\"480\" frameborder=\"0\" allowfullscreen></iframe>","width":720,"height":480,"provider_name":"Padlet Arcade","provider_url":"https://arcade.padlet.com"}