If you are learning the piano, the resources at key-notes…

https://www.musical-u.com/learn/practical-ear-training-piano-albert-frantz-key-notes-com/
If you are learning the piano, the resources at key-notes.com are invaluable to your musical progress. Learn more in this fascinating interview. https://www.musical-u.com/learn/practical-ear-training-piano-albert-frantz-key-notes-com/