In terms of vocal harmony, I think I can make a 3 part harmony. But what about 4, or 5 part harmony? How do I create does extra parts. Do I just duplicate a part and put it an octave lower or higher?
the best way to figure out what you're doing is spend some time with the piano keyboard. that way you can try it all out and see what you like. don't try to add more parts just because you want to say there's more parts. only do it if you wanna hear them