Shortcut to building 7th chords on the middle 4 strings

Here is a quick reference for building chords on the middle 4 strings just by using intervals.

First, let's look at the major 7th chord construction as our example:
root -- 5th -- 7th -- 3rd....this is the relationship of the note sequence

Now in order to make ANY major 7th chord without thinking of the actual notes just think of these 4 notes need as 4 notes that are being separated by 3 interval spaces.

Here are the steps:

1.  From the root to the 5th you have a P5 or "perfect fifth"

2.  From the 5th to the 7th you have a M3 or "major third"

3.  From the 7th to the 3rd you have a P4 or "perfect fourth"

The beauty of this is that even IF YOU DON'T KNOW the notes on a G#maj7 chord, you can simply go to G# by finding it on the fretboard and follow the intervals on steps 1 through 3!!!

You can do this operation with any chord quality by simply increasing/decreasing half/full steps as needed.

The important thing is to know your "math" on the fretboard.  By "math" we mean "intervals".
 
Have fun :)