Singing is worship.
I do believe in my heart that the LORD loves music like every human being does. When you sing with all your heart no matter how good or bad your voice is, as long as you're doing it to give glory and praise to our GOD -- it has meaning. The presence of the LORD moves because she is always always touched from a heart that all wants is to give HIM worship. The motivation of your singing makes it all worthwhile. Pondering every word of the song and declaring it through a hymn that comes out of our mouth is something that touches GOD.