Here I list sites I find useful for musicians:
In case you need some guitar backing tracks you can get them here: Guitar backing tracks
Need guitar lessons? Look here:
ProducerSpot Best VST Plugins, Audio News and Reviews, Free Samples and Loops
Royalty Free Music from All Music Library
The highest quality royalty-free, buyout, and production music tracks available. All music from All Music Library comes with an UNLIMITED royalty-free license at a very competitive price.
Music Library Report (musiclibraryreport.com) : Where composers rate the music libraries.
All Guitar Chords – Chord finder, including split chords and chord variations. Also features standard and exotic guitar scales.
Guitar-Chord.org – Learn guitar chords and chord progressions.
ClassClef.com -ClassClef is a non profit website dedicated to all classical guitarists seeking free sheet music, gpx and midi.