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Can someone please tell me what exactly is the differance between a minor 7th and a major 7th? (Besides the sound obviously! I am referring to how to find the notes of the chord.) Thanks.
For C7 or Cm7 verything is the same except the 3rd of the chord. So if you are playing C, these are the note C E G for major, C Eb G for minor. The Eb is one semitone, or fret, lower than the major. If you play a C barre chord on the third pos, then make it a C, you can see that is the only difference there.
Now if you add a seventh, the Bb, to either chord, it is a seventh chord. C E G Bb, C Eb G Bb
Then there is the C major 7, which may be what you were talking about. It is the same as a C7, except the seventh is a B rather than a Bb. The reason it is called major, is because the B is from the major scale. (Bb is from the minor scale)
between 3 and 4 and 7 and 8 u have a half tone,between any other notes there is a tone=2*halftone.
now , the reason that we have a minor 7th and a major 7th is because in Do major scale (C major ) the distance between 1 and 7 note (C and B) is exactly 11 halftones.
In a minor scale like A minor (La minor) 1 2 3 4 5 6 7 8 la si do re mi fa sol la if u count the haltones between 1 and 7 ,u'll find u have only 10 halftones(remember the two halftones are still between mi-fa (E F) and si-do (B-C) just like in C major.
using A minor (and any other minor scale) we defined the minor 7th and using the C major scale (and any other major scale) we defined the major 7th.
strictly math ,the diference between the one and the other is that one has 11 halftones and the other 10.
Also the minor 7th is called dominant 7th.It's the same thing ,but a different name (the reason for that is mathematical and historical (probably) and i dont wanna go there).
Now ,if Todd say C7 he means =C major with dominant 7th(or minor) and the minor 7th of C is Bb ,cause ....well,count the halftones...u'll find that u'll have 10.
there is another thing u should now ,what's the name for every note in any scale. It is important
well , read all the lessons from that site ...i'm reading them too.
quote:
By way of a brief review, you know that dominant chords are built on the fifth degree of a scale, and must be major in quality. This is because in a dominant chord, the 3rd of the chord acts as a leading-tone to the tonic. For example, in C-major, the dominant chord is a G-major chord. The 3rd of the G chord ('B') is a leading-tone to the tonic. And the most important feature of dominant chords is that they "point to" the tonic. To use the vernacular, they "sound like they want to go to" the tonic. The root of the tonic chord is a fourth above, or a fifth below, the dominant, and that's the chord that the dominant wants to move toward. Study and listen to this example:
u can listen examples too,cool one ...this one was in 1st google page
Ryan could u help me with your knowledge on paintings , i gave that article u wrote to the girl....No,I didnt took the credit,I said it was you ("look a friend of mine wrote this,I agree " -"Clever one! " -"Oh,all my friends are like that ...once u get to know me ")
Sorin, actually my major is literature, though I have done other arts. Email me if you need anything.
I sort of get the idea about minor and major 7th now, I will just need to be more familiar with the different scales I guess, or I'll end up having to stop and mentally count all the time! Thanks guys
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" -"Clever one! " -"Oh,all my friends are like that ...once u get to know me 
")
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