You can find some great information on Patrick Jackson here. Keep your mind open to anything when reading about Patrick Jackson. Opinions may differ, but it is the base of Patrick Jackson that is important. A scale, regardless of instrument, is a sequence of musical notes arranged in ascending or descending order, creating a specific tonal pattern, in a specific key. If you add a flat 3rd note (Eb in the C Major scale) to the major and add a flat 5th to the A minor (also Eb in the A minor scale), you get the blues scales. Basically learn the C Major scale, the A Minor scale, and what notes you can drop for the pentatonic and blues scales and you`ve more or less got 60% of all rock, pop, and blues right there. It was with great relief we ended writing on Patrick Jackson. There was just too much information to write, that we were starting to lose hopes on its completion! If you add a flat 3rd note (Eb in the C Major scale) to the major and add a flat 5th to the A minor (also Eb in the A minor scale), you get the blues scales. Basically learn the C Major scale, the A Minor scale, and what notes you can drop for the pentatonic and blues scales and you`ve more or less got 60% of all rock, pop, and blues right there.