Hi!
Cm7 (C minor 7) is made of the notes C Eb G Bb
Proctor, you wrote C Eb G B -> It's okay with the Major/minor theory, but this is rather a CmMaj7 chord (which is quite rarely used)
The rule is, as proctor said, for any chord:
Major: 1 3 5
Minor: 1 b3 5
There are two types of Seventh chords:
Major Seventh: 1 3 5 7
Dominant Seventh: 1 3 5 b7
When they write or say C7, D7, Cm7 and so on, it's the DOMINANT SEVENTH that is implied. That's the b7.
But whenever you see CM7 or CMaj7, it's the Major Seventh that's refered to. That's the 7.
So here are the rules and some exemples:
DOMINANT 7th CHORD 1 3 5 b7
C7: C E G Bb
D7: D F# A C
E7: E G# B D
MAJOR 7th CHORD 1 3 5 7
CM7 or CMaj7: C E G B
DM7: D F# A C#
EM7: E G# B D#
MINOR 7th CHORD 1 b3 5 b7
Cm7: C Eb G Bb
Dm7: D F A C
Em7: E G B D
MINOR MAJOR 7th CHORD 1 b3 5 7
CmMaj7: C Eb G B
DmMaj7: D F A C#
EmMaj7: E G B D#
I hope this will help you. I didn't want to write a *full* music theory course, so if you have any question or comment, feel free to post them.
Just remember this:
- when it's about Major/minor, it's the 3rd of the chord that's concerned
Major: 1 3 5
Minor: 1 b3 5
- when it's about Sevenths, it's the 7th
Major Seventh: 1 3 5 7
Dominant Seventh: 1 3 5 b7
- when it's about Augmented/Diminished, it's the 5th
Augmented: 1 3 #5
Diminished: 1 b3 b5 (yeah, the b3 and the b5, sounds cool
)
- when it's about Suspended chords, you remove the 3rd
Sus2: 1 2 5
Sus4: 1 4 5
This is so simple, all you have to do is know your major scales.
Peace, and God bless!