Note that the Price ballad is directed to be sung to several different titles, one of which is "Summer Time", but this could belong to several tunes. Calino is the direction for a 17th century ballad, "A Pleasant Song made by a Souldier", which begins "In summer time when Phoebus raise" [printed in Roxburghe Ballads VI.284]. "The FF of SM" would fit Calino well, I admit, and Rimbault thought so as well in 1850 (Musical Illustrations of Bishop Percy's Reliques, from a manuscript of c. 1630). Bronson (Trad. Tunes of the Child Ballads) seems to have no opinion on this, pro or con..