Me? How would I handle it? Well...I guess I would NOT go and tell anyone else that I have been told that he was saying this about me to someone, and that the person who overheard it came and told me.
I would be guilty of spreading the gossip.
What I suppose I would do, is to go directly to the person I work UNDER, who is the one who said the hurtful thing, and I would tell him face to face, "I am officially turning in my notice, and stepping down.
Because it has been called to my attention that YOU were "openly bashing my musical abilities (or lack thereof, apparently) behind my back. The statements were very hurtful, and this is not the first time that your behavior towards me has been critical.
I had trouble deciding if I should confront you directly, or have a meeting with our Pastor. But, I decided to just go ahead and step down, without involving anyone else. I don't want to spread what someone else has told me. No matter how it hurt me.
I could certainly handle being told that there are areas that need improvement, but bashing me behind my back within earshot of other people is humiliating." (By the way...all this was quoted from your original post! Well, almost word for word.)
My bet is that he'll lie awake at night, wondering who in the world overheard him, and told you!
And you know what, my friend? I'm sincerely thinking that God is getting ready to promote you! To something much better!
Perhaps you just need to turn in your notice to the one you are 'WORKING UNDER'!!!
My favorite scripture: Malachi 3:16
"Then they that feared the LORD spake often one to another: and the LORD hearkened, and heard it, and a book of remembrance was written before him for them that feared the LORD, and that thought upon his name!" (Every time we speak of the Lord, or even THINK of him--its written down in a book of remembrance!)