This guitar lesson focuses on the blues scale and shows you a bunch of tricks to help you use it wisely. The blues scale is based on a minor penatonic scale, but includes the flat 5th note. Most popular rock songs have roots in the blues scale. Learning the forms of the blues scale will come in handy if you plan on playing guitar in a rock band. Check out this blues guitar how to video and you will be on your way to playing lead guitar.