Share 'penny whistle'

This may be sort of a "duh" question, but I have to ask. My church has been playing "Be Thou my Vision" for quite a while, and I thought a whistle would sound so good there. I went to my local music store and bought a $12.95 metal whistle with a plastic mouthpiece. I can play the song, but it sounds sort of like a new violin player trying to learn how to use a bow. Esp the upper register My quest…