MASON'S CAP, THE. AKA and see "Mason's Apron." Scottish, Reel (2/4 time). A Major. Standard tuning (fiddle). AABB. One of the "Mason's Apron," "Wake Susan/Wake Up Susan" family of tunes, albeit with an initlal interval jump much more modest. The "Mason's Cap" title seems unique to Boston music publisher Elias Howe & Co. publications, but Howe (in Musician's Omnibus Nos. 6 & 7) identified the provenance as "Scotch".
Additional notes
Printed sources : - Cole (1000 Fiddle Tunes), 1940; p. 16. Elias Howe (Musician’s Omnibus Nos. 6 & 7), Boston, 1880-1882; p. 597. Ryan's Mammoth Collection, 1883; p. 39. White's Unique Collection, 1896; No. 46, p. 9.