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