Internet Music Score Library Project - A fantastic resource for musicians, contains a huge selection of free sheet music in the public domain.

 

REC Music Foundation - An archive of lied, artsong, and choral texts and translations.

 

WordReference.com - A completely free bilingual dictionary between English, French, Italian, German, Spanish and more. Also contains IPA (Internation Phonetic Alphabet) pronounciations.

 

The Diction Police - A podcast/blog by Ellen Rissinger, an American Vocal Coach/Accompanist on the music staff of the Semperoper in Dresden, Germany. Covers a wide variety of repertoire in an engaging manner. Check her out!

 

Teoría - A free online music theory resource containing tutorials, quizzes, and activities.

 

MusicTheory.net - Another great online music theory resource.