...like sheet music. Available as PDF and Lilypond source code. Hopefully, there will be more of it soon.
"Danny Boy? You're at my funeral singing about some dead stiff named Danny Boy? You really are a massive bonehead!" - Futurama
(.pdf, .ly) In memoriam Daniel, who is still alive, by the way. This is F. Weatherly's original version from 1913 transposed to E flat. Taken from scanned images from the Duke University Library.
All transcriptions published under the GPL.