You don't need to know many guitar scales to play guitar ... You should be able to see that the C major pentatonic scale uses all the notes from a C chord, plus a couple of extras.

From bossanovas to Carole King and even James Bond villains, the major seventh can completely change your song’s mood.

Harmonic minor keys are used when writing chords ... the triads in C major are as follows: Triads can be indicated by Roman numerals of the degrees of the scale. In the jazz styles of Gershwin ...