Naxos Music Library is the most comprehensive
collection of classical music available online. It includes the complete Naxos
and Marco Polo catalogues of over 165,000† tracks, including Classical
music, Jazz, World, Folk and Chinese music . While listening, you can read
notes on the works being played as well as biographical information on composers
or artists in Naxos's extensive database. (From publisher's website- of June
2006)
http://valparaiso.naxosmusiclibrary.com/
Trainear - A selection of tools to help strengthen musicianship skills, especially intervals. Relates all intervals to popular musical references. http://trainear.com/
Musictheory.net - Offers lessons, exercises, and tools to help students develop theory and ear training skills. Reading music, intervals, and chords are all included in this website. http://www.musictheory.net/