カウントアップ を作成する

https://musescore.com/groups/fenrir/discuss/2064161 https://musescore.com/groups/fenrir/discuss/2064161 https://musescore.com/groups/fenrir/discuss/2064161 https://musescore.com/groups/fenrir/discuss/2064161 https://musescore.com/groups/fenrir/discuss/2064161 https://musescore.com/groups/fenrir/discuss/2064161