My ds might have some apps he knows of - I'll ask him tonight. Have you ever heard the acronyms for remembering treble and bass clef notes? I think most everyone learns them in school, but if not - they are useful for remembering which note is which!

Treble Clef lines: Every Good Boy Deserves Fudge (E,G,B,D,F from bottom to top)
Treble Clef spaces between lines: FACE (spells FACE, bottom to top)

Bass Clef spaces: All Cows Eat Grass (bottom to top)
Bass Clef lines: Great Big Dogs Fight Animals (bottom to top)

Hope that helps!

polarbear