Music Instruments
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"A huge list of accordion websites."--Source.
Experience Music Project encourages visitors to listen, learn, participate in making music, and experience the power and joy of music in all its forms.
Has guitar links on the Net and "hosts a series of lessons on chord construction and theory. "--Source.
"This site is one of the most up-to-date sources on the net for guitarists and guitar lovers and is updated daily."--Site.
Online resources for musicians (guitarists, pianists...).
Music Instruments from India.
Music Instruments from India.
Links to interesting music sites (Instruments, Opera, Classical, Jazz, Reggae, Gregorian Chant...).
The Official Guitar
Chord of the Week Archives. 
Learn how to play guitar chords.
Musical journey into piano lessons.
"Our goal is to provide as much information about
pianos as possible.
Inside Piano World you will find information about: Piano Tuners, Piano Teachers, Piano
Movers, Piano Dealers, Piano Actions, Restorations, Piano Books, Pianos For Sale, Buying A
Piano, Piano Care..."--Source.
Play the piano or keyboard with only one lesson.
"The definitive, sure to work tutorial, for learning to play the piano. If this lesson is taken to heart, you will not need any other lessons."--Source.
Guitar resources on the Net.
Lot's of interesting links to guitar resources on the Net.
Learn how to play guitar.