The tin whistle, sometimes called the penny whistle, is a Celtic instrument similar to the recorder.
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Flute Sheet Music
For any Irish tune - Check out Martin Dardis' website. It has song lyrics with guitar chords sorted by group. I like how the songs are grouped with a video so as to help you in the right sound direction. It also has a section for the tin whistle and a section for those learning to play guitar. Have fun!
Hedgwig's Theme (Harry Potter) - It's not quite right but enough of the general gist to figure out the rest - found somewhere on Pinterst