I'll see if I can find anyone with knowledge of Prof Rowlands. Those early Welsh collections tunes did not publish words with music, even when words were available, so there's no knowing if there were any words *particularly* associated with the tune prior to the above mentioned crop.

When I was browsing through Bruce O's ballads index re: another thread, I also noted the following:

Long ere the Morne expects the return/ ZN1707| Maister Basse his Careere/ Tune: new Court tune [Bass's Career]/ P1 452-3: E. A[lde]. [RPB2 52. On same sheet, "Earely in the morne, when the night's ouerworne," N818|. Parodied in song in BL MS Addl. 30982, "On a Welshman hunting of a haire"] [The Hunter's Song/ COB3 196, without tune indication]

sian