A Halling is a Norwegian dance tune. That’s all I know …..; perhaps someone could give a few more details?
Wat is halling
Hallings are dance numbers, generally performed by the men in an effort to impress the women.
Details about halling [not impression of women ;-)] is found in english here:
It has the feel of a ‘squared’ waltz,
… one could easily leap or lapse into 3/4…