Blues scales are another important part of the gutiarist's tool box. That said, it should be made clear that blues scales are far easier to play and remember not as new scale and new scale shapes, but an extension of the pentatonic scale and scale shapes you should already know. As the diagrams will demonstrate, the pentatonic scale and the blues scale are almost identical. In fact the only difference between the two is that the blues scale has one additional note.
The following scale diagrams are the same ones found in the pentatonic section. As usual, the dots refer to what notes to play and the red outlines identify the root notes of the scale. These diagrams also feature dots with blue outlines. These are the additional notes (called blue notes) that the blues scales have over the pentatonic scales.