Other
Proposed Extensions of Clef Notations for Abc
This site details "proposed extensions of clef notations for abc." The author has suggested a method of "extending the abc syntax to accommodate clefs other than the treble clef." The author makes it very clear in the opening two...
Other
The Basics of Reading Music
This site is an overview of how to read music. The basics of notation such as note and rest values, the names of lines and spaces of both treble and bass clefs, etc. are covered. Includes downloadable audio files.
Other
Piano Music Sight Reading Practice
Actually this clever site drills pianists on note names and note placement on the keyboard. Kids can access this site at home for practice. Both treble and bass clef are used.
Music Theory
Music theory.net
An online beginning music theory and ear training site. This site is for students to use at home to reinforce what they learn in class.