I've just (sort of) finished re-scoring a local "Irish Session" book.
The original book was a sort of unsorted mishmash of conversions from MIDI, ABC, downloads in various formats, etc. I now have all 380 tunes from the original book re-entered, one note at a time, into my scoring program.
Then, just because I'm something of a perfectionist, for tunes for which the local version is significantly different than what appears to be the most common version, I added the "generic" variation.
And then, where I found a different variation that seemed to be established in other locations - in more than a couple of other "regional" books - I added a "western" variation.
I have separated out the few that appear to non-traditional, so that I can add them back when/if I can secure proper permissions.
"Proof" sheets that could be used to print the book have been made.
Disks are ready with "literal midis" of each tune, to go with the book.
(my SO made herself a T-shirt that says "does anal retentive have a hyphen" just to wear when she goes out with me)

Taking the edge off the glow, though:
With about 780 tunes, the book is so big that none of my friends want (or can lift) a copy.
And printing all the trials and proofs has ripped the guts out of my faithfull little PostScript printer (tore the teeth out of a paper feed gear).
I can't really afford to make copies to see if anyone wants it.

Oh well, I've got the best D... session book around - If I really could play any of that stuff!

SWTIME - Smiling With Tears In My Eyes.

John