Paid Guitar Lessons Links

GuitarAlliance - Recommended
A great site to learn how to play the guitar. There are 3 trial lessons from GuitarAlliance which you can access here.

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Guitar Mojo
A site dedicated to lessons on blues in particular.

Riff-o-matic
"An effective way to boost your guitar playing ability 266% while learning techniques, tricks, licks, riffs of guitar greats past and present." 

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Just Acoustic
Read more information about this site here.