MUSIC THEORY


Metronome
Can use online or even download an app for your phone for $5.99.  (Oddly, Verizon Wireless, Blackberry or iPhone phones are currently NOT supported!)
http://www.metronomeonline.com/

 
Blank Sheet Music
All kinds of staves and systems.
http://www.blanksheetmusic.net/


Chordhouse
Look up any kind of scale or chord.  Very useful if you experiment much with modes.
http://www.looknohands.com/chordhouse/piano/

 
Jamstudio
An online music factory.
http://www.jamstudio.com/Studio/index.htm

 
Dolmetch
Good reference tools.  Not the most user-friendly.  L
MUSIC HISTORY & THEORY:  http://www.dolmetsch.com/theoryintro.htm
MUSIC DICTIONARY:  http://www.dolmetsch.com/musictheorydefs.htm


Ecclesiastical Latin Guide
Concise.  Great source for Church Latin rules.
http://www.ewtn.com/expert/answers/ecclesiastical_latin.htm

 
Intro to Music Theory
Tutorials.
http://www.tutorials.com/09/0917/09178.asp

 
Good Ear
Fun ear-training exercises that anybody can do with access to the internet.
http://www.good-ear.com/

 
Rhapsody
Good collections of church music.  You get 25 free plays per month.  (Or you can join up and get unlimited plays.) 
http://www.rhapsody.com/home.html