Major Seventh Chords
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A major seventh chord is a four note chord consisting of the 1st, 3rd, 5th and
7th degrees of a key.  For the key of C, Cmaj7 would consist of C, E, G and B.


Cmaj7, C form   Cmaj7, A form   Cmaj7, G form   Cmaj7, E form   Cmaj7, D form
===========     +-+-+-+-+-+     +-+-+-+-+-+     +-+-+-+-+-+     +-+-+-+-+-+
| | | | | | -1  | 1 | | | | -3  | | | 1 | | -4  | | | | | 1 -7  | 1 1 | | | -10
+-+-+-+-+-+     +-+-+-+-+-+     +-+-+-+-+-+     +-+-+-+-+-+     +-+-+-+-+-+
| | 2 | | |     | | | 2 | |     | | 2 | | |     | | | | 2 |     | | | | | |
+-+-+-+-+-+     +-+-+-+-+-+     +-+-+-+-+-+     +-+-+-+-+-+     +-+-+-+-+-+
| 3 | | | |     | | 3 | 4 |     | | | | | |     | | | 3 | |     | | | 3 3 3
+-+-+-+-+-+     +-+-+-+-+-+     +-+-+-+-+-+     +-+-+-+-+-+     +-+-+-+-+-+
| | | | | |     | | | | | |     | 3 | | | |     | | 4 | | |     | | | | | |
+-+-+-+-+-+     +-+-+-+-+-+     +-+-+-+-+-+     +-+-+-+-+-+     +-+-+-+-+-+
===========     ===========     4 | | | | |     ===========     ===========
x   3   7       x   5   3       +-+-+-+-+-+     x   1   5       x   1   7  
  1   5   x       1   7   x     ===========       x   3   7       5   5   3
                                1   5   x  
                                  3   7   x