Watch the Major Pentatonic online guitar lesson by Bruce Arnold from Jazz Guitar for Beginners
The Major Pentatonic is used over a major chord. It is one of the most used scales in music. This is because of the close relationship to the Major scale and its ability to be used over a Major tonal center.
Remember, think the notes or the degrees when learning the Major Pentatonic scale.
If you are practicing A Major Pentatonic, use a jam track for AMajor7 as a backing track so you hear the scale in the right relationship. You should of course know this scale in all keys.