So an accordion player played this tune, which he called "Eddie Kelly's", and I thought it was great. However, it seems to go way below whistle range. I tried switching to an A whistle, but it still doesn't fit. Is anyone familiar with how this is played in a session setting on a whistle?

Both of these videos play it in the same key.
https://youtu.be/sAd03DOoZkQ
https://youtu.be/W2E5uN0u1Hw

Here's the tune on The Session:
https://thesession.org/tunes/1511

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Nathaniel James Dowell

Check out my various whistle comparisons on my YouTube channel:
https://www.youtube.com/playlist?list=PLyujhpemdQEcjOVM20DGKTX2PKWz4b8Yo

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The Meelick Team, the one on thesession you linked to, has one B below whistle range. Play it on a D whistle with that one B raised an octave and you're flying.

Look up 'folding' on the forum.

For a bit practice and to get your head around this, try for example The Castle jig . it's perfectly doable on the whistle, despite slipping down to low G, taking in the rest of the notes on the G string of the fiddle on the way.

Or the Humours of Lissadel, Glen of Aherlow, Martin Wynne's #1&2, Dooney Rock that sort of tune, any amount of fiddletunes that dip into the low string.

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My brain hurts

That's helpful. Normally, I can figure out the optimal setting for a whistle, especially if I know it's in D. The last tune I started learning went similarly off the scale, but Jem pointed out that it was actually transposed down below where it was typically played, so I learned it on an A whistle, and then could play it just fine on the D. This one didn't fit on either, and got me turned around and questioning my existence. Thanks for sorting me out.

_________________
Nathaniel James Dowell

Check out my various whistle comparisons on my YouTube channel:
https://www.youtube.com/playlist?list=PLyujhpemdQEcjOVM20DGKTX2PKWz4b8Yo

Or like my author page on Facebook: https://www.facebook.com/NathanielDowellPhotography/