The various MIDI files I find online are not in any major key they are in A Minor. Like this: Am Am G Am Am Am Em Am Am C C Em Dm Am Em Am Am
The phrasing goes like this: Fare ye / well love-ly /Nan-cy for /I must now /leave you. I am / bound to th'East /In-dies my /course for to /steer. I / know ve-ry /well my long /abs-ence will /grieve you, B-ut / true love, I'll be /back in the /spri-ng of the /year