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Though it's not really a "Christmas" tune, the song "Edelweiss" from "The Sound of Music" has become associated with Christmas from its repeat airings on television around this time. The band at the Biergarten in the Germany pavilion in Epcot also like to perform this tune on handbells during the annual Candlelight Processional celebration. Here is a tutorial on playing "Edelweiss" in dd-A-D tuning (Mixolydian) and a few tricks on how to play the tune as originally written - with the elusive Gm chord.
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