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I have taken some college-level music theory, and answering your question is more complex than you might think. There are two major issues you'll deal with: key signatures and scale.
We'll start with your scale: D, D# F, G, A A# and C. You're actually in the major key of Bb (at least, in it's simplest form. D Phygian is correct if your 'root' note is D.) The basic scale is Bb (A#), C, D, Eb(D#), F, G, A. Now, the D sounds really good because it is either your root or a third from the root. It is the middle note in a Bb I. major triad. Now a 'C' will dissonant because it is too "close" to the root. The same goes for 'A'. These notes are useful for creating tension in your music, used as a suspension.
Ok, to learn chords, you need to start with the basic triad. If you are in a scale (say C for example), you can create a C major chord by playing C, E, and G together. This is the I. (or first) major chord in that key signature. There are three natural major chords in a scale, I, IV, and V. That is in C, the triads that start on C, F, and G. The others, ii, iii, and vi are minor chords. The chord starting on B is a special case called diminished -- it's a minor chord with the 5th being a half step lower.
Sorry if that was a little confusing, but it takes years to get everything straight. To give you an idea of what you're up against, here's a chart of natural chord progressions:
http://members.aol.com/chordmaps/genmap.htm
Ack!
If you have any specific questions, I'll be happy to help though!
Last edited by Haimoimoi on Sep-18-2002 at 20:21
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