Chords:
http://www.looknohands.com/

http://www.free-online-piano-lessons.com/

Scales:
http://www.free-online-piano-lessons.com/

http://www.looknohands.com/

http://www.apassion4jazz.net/scales2.html

History:
http://www.uk-piano.org/history/history.html

http://www.cantos.org/Piano/PianoHistory.html

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Violin

Chords:
http://www.folkofthewood.com/page4066.htm

http://www.rpsoft2000.com/music/violin-chord.htm

Scales:
http://members.tripod.com/~mrfiddle/scales.html

http://www.sibeliusmusic.com/cgi-bin/show_score.pl?scoreid=25214

History:
http://www.nelson.planet.org.nz/~matthew/cbt.html

http://www.digitalviolin.com/Review1.html

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http://www.DavidFranklin.org - Author David Franklin's website

http://www.guitaronemag.com

http://www.mysongbook.com

http://www.hemkundoverseas.com/ - Dealer of musical instruments

http://Music.guidecentral.com - Music at GuideCentral.com

Piano sheet music - Sheet music, Piano sheet music, Music scores, Affiliate program

Guitar Lessons DVDs w/ Free Guitar Lessons online! - Ever considered playing electric or acoustic guitar but did not know where to start? You can begin playing and learning guitar today! Free online video samples and guitar lessons on DVD! This is the best price for beginner guitar lessons online!

Online music lessons - Online lessons from AllStarMusicLessons.com

http://www.GuitarTabBooks.com - Free Online Guitar Lessons, Sheet Music, Instruction Books, Videos, and Online Music Store hosted by Billboard top rated instructor, Scott Morris.

Piano Lesson - Tammy Widjaja’s website Site Piano Music instrument in Jakarta Indonesia

1000 Guitar Sites - Huge list of guitar resources