Online Practice Tools
Basics of Music Notation
Ricci Adams’ musictheory.net
Basics of reading music, with exercises, quizzes, etc. Very helpful!
Teoria
Another great site, chock full of info. Also includes ear-training exercises.
Sonicfit
Very useful games, exercises, and videos explaining and reinforcing important music concepts.
Rhythms and Counting
An interactive site that will help improve your rhythm skills and understanding.
Method Behind the Music
Basic music notation info and concepts.
Mario Paint Music Composer
Create music that sounds like Super Nintendo
Chrome Music Lab
Ear training
http://trainer.thetamusic.com/
http://www.musictheory.net/exercises/ear-interval
http://www.earbeater.com/online-ear-training
http://pitchimprover.com/
https://www.good-ear.com/
http://www.musictheory.net/exercises/ear-interval
http://www.earbeater.com/online-ear-training
http://pitchimprover.com/
https://www.good-ear.com/
Sight Reading
https://sightreadingmastery.com/
http://thesightreadingproject.com/
https://www.sightreadingfactory.com/
http://thesightreadingproject.com/
https://www.sightreadingfactory.com/