Simpson wasn't convinced by Chappell's remark that "it is probably the right air". It isn't impossible, but there is no particular evidence to support his guess, beyond compatibility of metre and the mention of "high mountains"; which isn't exactly a novel phrase.

"The relationship between the tune of 'Love will find out the way' and 'Over hills and high mountains' is puzzling. The latter tune name is derived from the opening line of 'The Wandring Maiden ... To an excellent new Tune' (B[agford] B[allads] II, 572 [and Pepys 3.165; see link above]); and this ballad is so evidently a paraphrase of the earlier 'Truth's Integrity' that one is inclined to wonder whether the tune for it was indeed 'new,' or whether its description was merely a part of the advertiser's dernier cri psychology. We do not, at any rate, possess a tune called 'Over hills and high mountains,' although several late seventeenth-century ballads cite it for singing.

"Four ballad operas use a tune called 'On yonder(s) high mountain,' ¹ for which no original words have been found; it bears a family resemblance to 'Love will find out the way,' despite a good deal of difference in harmonic and melodic detail.

¹ ... Chappell (PMOT II, 682) used this music with one of the ballads calling for 'Over hills and high mountains,' but he recognised the lack of positive documentary evidence to link the two tunes."

Claude M Simpson, The British Broadside Ballad and Its Music. New Brunswick: Rutgers University Press, 1966, pp 472-474, Love Will Find Out the Way.