11. Voice Performance: Exercises
http://www.online-communicator.com/hard2say.html
Saying tongue-twisters may help to improve diction. Here is a list of intentional and un-intentional (examples in real life) tongue-twisters.

12. Original Online Ear Trainer
http://www.ossmann.com/bigears/
Big Ears is an interval driller. It plays a random interval and then allows you to guess which interval was played. This is great for training your ears to recognize the notes in an interval (the space between two notes), and its kinda fun.

13. Gary Ewer's Easy Music Theory
http://www.easymusictheory.com/lessons.html
Free Lessons 1 through 25 on music theory complete with instructions sheets quizzes and answer sheets.
Website sells complete lessons on CD.

14. Dwayne’s singing page
http://notsosynonymous.tripod.com/sing.html
Have articles for example: “50 great singing tips” and “not so frequently asked questions”. There are also publications about singing, learning music and being in a choir.

15. Voice and Singing
http://borntosing.com/
This site sells vocal products and teaching tapes, CD’s on the art of music and informative videos.

16. ClassicalUSA.com
http://classicalusa.com/
 Here are links to the best sites for classical music, fine arts, Jazz, theater and movies.

17. Freesheetmusic.net
http://www.freesheetmusic.net/sheet_music_categories.html
Links: free sheet music, lessons, tips, and articles; many instruments links and links to songwriting webpages.

18. Free Sheet Music Guide
http://www.freesheetmusicguide.com/
Here you can find free sheet music for almost any type of instrument, voice, and the popular songs of the day.

19. Freescores.com
http://www.free-scores.com/index_uk.php3
Free sheet music for an assortment of instruments: Flute, Ocarina, Tuba, Dulcimer and much more, some choral music, Harpsichord and Piano.

20. Note Perfect
http://www.noteperfect.net/
This site is designed to help you learn the notes to selected Choral works, enjoy yourself, and you sing your part confidently.