The key is to keep your heart focused on what the music says to you, and what you want it to say to others. Increased skill in your physical technique can make that flow more smoothly, so long as you don't shift your focus to the technique and lose sight of the heart of the music. There are indeed those whose music sounds mechanical and lifeless. It's as if what they're doing is putting out the notes and/or words, but not actually playing the tune or singing the song. I get the feeling that their emotions are disconnected from their body.