Quick mode question
 

I need your help to clear this up.

In the key of c...

Aeolion is abcdefg, I.E. the relative minor scale.

C minor is the parallel minor scale.

And I can play both, and sound good (in the key of c). Correct?

Yes...with some exceptions. It depends on the nature of the chord progression you're playing in, but I'll let GuitarBizarre field this one when he gets to it.

Playing minor in dom7 chords (such as C7) is an accidental that usually works it gives songs a bluesier or funky feel

You're correct. Of course Satchmo is right, though, about the chord progressions.

C major and A minor are the corresponding scales with the same key signature, so they will fit into the key of C.

C minor is the corresponding scale to E flat/ D sharp... it doesn't have the same key signature as C or A minor.

I don't really know what you're asking, though?

I'm beginning to think he wants to play a minor scale with no accidentals probably on the piano, since it doesn't make much difference on any other instrument,which would mean dropping the C major down a minor 3rd putting the root in A.

I'mm be honest dude, I don't actually know that much theory in terms of notes and voicings and stuff. I'm very much a technical and structure kind of guy. The notes I play come about because I like them where they are. Everything I know is based on compositional principles and knowledge of instruments technicalities, knowing how they work and are played.

Ask me to play you a dominant chord in a key and I'll likely look at you blankly.

Good thing it's a music forum. =P

The problem here is that you're saying 'the key of C' and that doesn't really give anyone the whole picture. Do you mean C major? C minor? C aeolian? C mixolydian?

If you mean the key of C major, you can play notes from the C major scale, CDEFGAB, and then of course you can play all the C major modes so D dorian (DEFGABC) E phrygian (EFGABCD) F lydian (FGABCDE) G mixolydian (GABCDEF) A aeolian (also called the relative (natural) minor) (ABCDEFG) and B locrian (BCDEFGA). Of course you'll have noticed that those are all the same notes in different orders, so it's all largely irrelevant. In the key of C (major) just use CDEFGAB...

Use the C minor scale in the key of C minor.

When people say 'the key of C' they usually mean C major.

I don't think the op is coming back, so...