OpenStax
Open Stax: Catherine Schmidt Jones: Scales That Aren't Major or Minor
As the title suggests, this site defines and gives examples of various other types of scales including chromatic, whole tone, blues scales and more.
Open Curriculum
Open Curriculum: Scales That Are Not Major or Minor
To explain the various musical scales that cannot be classified as major or minor such as chromatic, whole-tone, pentatonic, blues, and scales from non-Western music
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.
OpenStax
Open Stax: Catherine Schmidt Jones: Half Steps and Whole Steps
Take a look at the two intervals of the half step and whole step and how they make up the chromatic and whole tone scales. This page includes a couple of self checking problems to test your knowledge.
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...
Arizona State University
Arizona State University: Keyed Horns and Slide Horns
This ASU piece of writing takes us on a journey through the development of the horn's ability to play a chromatic scale with some degree of ease. The "experimenters" are presented--their country, years of experimentation, and outcome of...
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.