question

Does Maj7 mean that there are seven notes in the progression or what does it mean.

Assuming the "Maj7" is a chord,
Once you've seen your other posted question on creating chords, read the following.

A seventh chord is adding the seventh interval. The three basic ones are A Major Seventh, Minor Seventh and Dominant Seventh.

In our case it is the Major Seventh, which contains the major triad, P1 M3 P5 and the M7.

It is only telling you what intervals are being used, not how many notes are being played, that is up to the musicians discretion or score.

Thanks That really cleared some things up I am Teaching myself and don't know much about music theory

yup, just what KicknGuitar said, although to be honest I don't really like the way he writes out chord formulas. There's nothing wrong with his way (it is just as correct, if not more!), except that personally I find it easier to just say what each interval is relative to the major scale, rather than relative to the root. My way, a major seventh chord (Maj7 or M7) would be written as 1, 3, 5, 7. No need to include whether an interval is perfect, major, minor, diminished, etc. by using letters, just use # for raised intervals and b for flattened intervals when needed. It's still important to know what a perfect 5th is compared to a diminished fifth, but when you are comparing chords my way, I think it is easier because there are no unnecessary letters.

To give another example, a harder chord, min13#11... Don't worry if you makes you confused to look at - it's just a chord like any other! It uses notes beyond the octave, but a 9th is just the same as a 2nd (6=6, 7=7, 8=1, 9=2), in the same way that an 11th is the 4th, and the 13th is the 6th. The min part of the chord name refers to the fact that it contains a minor 7th chord (1, b3, 5, b7), The 13 means it contains the 13th, #11 means it contains the sharpened 11th (augmented 4th), and because it doesn't say anything about the 9th, it DOES have one. If it didn't then it would say min13#11 (no 9th). Here goes...

KicknGuitar's way: P1, m3, P5, m7, M9, Aug11, M13

My way: 1, b3, 5, b7, 9, #11, 13.

(I know there are 7 notes in that chord - as a gitarist you have to decide what notes to play and what notes aren't needed. If you were playing with a bassist who is playing the root note, then you could omit it without any problems. If not, then you could get rid of the 5th, 7th or 9th without the chord changing drastically. Notice I didn't say if the 5th was perfect, augmented or diminished. That is because in the major scale, the 5th is a perfect 5th. The 7th however in the major scale is a major 7th but you need the minor 7th so I wrote down b7.)

Maj7 otherwise could just be the interval between the root and the major seventh, a gap of 11 frets (one less than an octave).

Good on you though for trying to learn some theory. It is really useful in the long run. If you play the keyboard/piano as well then I think it is much easier to think of all this stuff as notes on a keyboard, rather than frets on a guitar. The Cmaj scale is just the white notes, so if an interval is written as b5 for example then you go to the 5th note (G) and flatten it, to get Gb. Even if you don't play piano, it's still really easy to understand the layout of the keyboard.

Hope this stuff helps. I tried looking for some decent piano chord charts on google but I didn't find any so I'll make one tommorow and upload it.

Thanks that really helped