If I can play it, it’s easy! I made a Christmas CD for myself with music off mp3.com, before they closed up the free downloads site. I think the Mary Did You Know rendition on it is by Jennifer Avalon. She’s got a site w/ music downloads for free, but doesn’t include that song (yet). A number of her other Christmas songs though are a capella or voice and guitar - good accompaniment practice if you have a whistle in the right key.
My favorite low whistle riff is a more wistful take on Auld Lang Syne I learned from listening to a Steve MacDonald Scottish Christmas cd. Don’t know if it’s the same as yours.
I just played O Come, O Come Emanuel at dinner this evening for the beginning of Advent. On a D whistle, start on E and think E minor (or PM if you want the notes).
