Other
Music Theory First Aid for Struggling Students
This site provides music theory information on such topics as rhythm, intervals, scales, chords, etc. Also, there is a fine section which describes the basic concepts of form and structure.
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.
Other
I Was Doing All Right: Ear Trainer
An excellent online ear training tool is available at this website. Identify intervals, chords and short melodies.
Open Curriculum
Open Curriculum: Interval
To explain the concept of intervals and how to distinguish and classify the various intervals
Open Curriculum
Open Curriculum: Harmonic Series: Harmonics, Intervals, and Instruments
To demonstrate how the harmonic series can illustrate the relationship between frequency and interval and the harmonic series
Other
Musical Pitch
This site offers a very technical explanation of pitch. The author's emphasis is on tuning by intervals, explaining the different spaces of intervals by name. A very complex interactive diagram is included.
Toby Rush
Music Theory: Imperfect Intervals [Pdf]
A music theory worksheet regarding imperfect intervals.
Toby Rush
Music Theory: Perfect Intervals [Pdf]
A music theory worksheet regarding perfect intervals.
Toby Rush
Music Theory: Diatonic Intervals [Pdf]
A music theory worksheet regarding diatonic intervals and their relationship to pitch.
Other
Tone Savvy: E Music Theory
This site provides good online learning games and exercises for music theory. It also has a lot of options for teachers if they choose to subscribe.
Other
Functional Ear Trainer
This is a freeware software product that can help you develop your ear training. There is a basic and an advanced version of the program.
Science Buddies
Science Buddies: How to Make a Guitar Sing
This is a great project for musicians interested in the physics of stringed instruments. If you have ever played an acoustic guitar, you may have noticed that picking a single string can make one or more of the other (unpicked) strings...
Rock and Roll Hall of Fame
Rock & Roll Hall of Fame: Sti Lesson 44: Compositional Techniques
Young music students rarely see or, better still, hear a connection between the different types of scales, modes, intervals and other compositional techniques such as meter, tonality, and form used in both traditional 'Art' music and...
Open Curriculum
Open Curriculum: Minor Keys and Scales
To discuss the interval patter of minor scales and their difference from major scales
Physics Classroom
The Physics Classroom: Sound Properties and Their Perception
The concept of pitch and frequency is covered in this tutorial. Learn what frequency and pitch are, the difference between infra sound and ultrasonic frequencies, and how pitch is related to the frequency of a sound.
Other
Ruby Cliff Computing: Learn Guitar Theory With Virtualoso Guitar
This is a fantastic site that teaches basic music reading, especially as related to the guitar. Although the site is a promotional software site, the trial version is excellent by itself.
Other
Neanderthal Flute
Site provides information on the investigation of the Neanderthal flute that was found.