Take a look at "Scales And Chords Relationships" with Christopher Schlegel
I think the pentatonic scale is used in most rock, country and blues music.

http://www.guitartricks.com/search.php?input=scales+and+chords&search.x=12&search.y=10

here's link to major pentatonic scale tutorial with Doug Showalter

http://www.guitartricks.com/lesson.php?input=12681&c_id=13&ch_id=76&s_id=657

compart1