This is an Advanced twin fiddle arrangement of Westphalia Waltz. It’s in the key of G.
* The harmony fiddle part contains lots of double stops. If you aren’t comfortable with double stops, you should consider the Intermediate arrangement of Westphalia Waltz.
The sheet music is available as a downloadable PDF (with guitar chords), with a play-along midi file. Each of the fiddle parts are separate tracks in the midi file.