Whether you're trying to sing harmony, or trying to play an instrument better, you must learn to listen better. People tend to focus on the part of a song that most interests them and it's surprising sometimes how much of a tune they are actually not getting on a conscious level. Guitarists tend to listen to the guitar part, fiddlers the fiddle, etc.

Occasionally concentrate on a different part, even if it's a relatively dull part. Imagine you are the player/singer and you are responsible for that part, even if it's boring. You can't just happily get "into" the melody and groove along, you have to make sure that support is dead on. It does wonders for your ear, and that is where harmony singing starts.

Frank i.t.s.

p.s. "W.V.Serenader" I love corn but I think pop harmony comes in a can, I've only seen hominy in a paper sack.