Minor Pentatonic Scale
... The scale that is most often used to play in rock/blues context is the minor pentatonic scale. Minor pentatonic scales are derived from the seven-note major scale. There is a formula that shows how to obtain this scale. ... This means that based on a major scale you are going to use the first note, the third note flat and so on. For example, the C major scale contains C, D, E, F, G, A and B. Therefore, the C minor pentatonic scale contains C, E, F, G, and B.