In the song Engel, Richard Kurspe Whistles a tune.
I've tabbed that whistle best I can onto guitar.
It's only the main whistle, as about 3:51 minutes into the song,
he whistles a different tune.
I haven't figured that part out yet
but when I do I'll post it.
Note: Important to listen to song for timing. :)
E---9---9----------------------------
B----------10---10-------7---7-------
G---------------------------------9--
D------------------------------------
A------------------------------------
E------------------------------------