Watch the Major Scale online guitar lesson by Bruce Arnold from Jazz Guitar for Beginners
The Major Scale is also one of the most used scales in music. As previously mentioned the Major scale has a close relationship to a Major Pentatonic.
Whenever you use a Pentatonic scale you could also use a Major Scale. The Major scale is used over any Major tonal center. You can use the Major Scale in any chord progression where all chords are heard in the parent Major key.
Remember to think the notes or the degrees when learning the C Major scale and use a jam track for CMajor7 as a backing track so you hear the scale in the right relationship. You should of course know this scale in all keys.