Randam Chord Generator
https://takafumisuenaga.com/ramdom-chord-generator/
Ear Traning
https://takafumisuenaga.com/ear-training/
Rhythem Checker
https://takafumisuenaga.com/rhythm-game/
Metronome
https://takafumisuenaga.com/2025/11/20/1177/
Jazz Standard Selector
https://takafumisuenaga.com/2025/11/23/1183/