Delta Male wrote:
Is there good way to determine what the back-up vocalist will sing?
You don't have to sing in different octaves and unison singing has its place, but you have to learn to sing in harmony. You don't have to sing notes that are far apart on the scale (refer the Everly Brothers:
Bye Bye love;
Dream, Dream, Dream or
Let It Be Me, et. al.).
Best way to do this is learn some theory - then simply sing the intervals (third's, fifths, sevenths, etc. - both above and below). Otherwise work out a harmony by trial and error and then simply practice until you can nail it every time. If you play the guitar along, you can often figure out what note in the chord the melody is and then simply pick out one of the other notes from the chord as the harmony note.
Here is a good explanation:
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In studio, I often "cheat" and use a harmoniser to create a harmony vocal that works in my limited range, then I solo that vocal part and learn how to sing in unison with that. ? Practice that to death until I'm completely comfortable singing it. Then I can practice singing it with the melody.