Just a slight exageration, I haven't read everything at Gathersburg. Mostly folk songs and ballads. But most good stuff is in the reference section, like some folk, a few editons of Grove's Dictionary, old pop songs and old plays-e.g., the dates that Kitty Clive sang her Gaelic "Aileen Aroon", and Mr. Birkhead's "Jack on the Green" was performed (very popular tune later). I've also used the reference book there on libraries to find contacts, and got the tune "Peggy Darby, or the Dandies' [best known as "Bonnie Lass of Fyvie, O", opr "Constitution and Guerierre", or Judge Learned Hand's "The Iron Merrimac" (Merrimack in Levy collection] now) in vol. 3 of Aird's Airs from the Forbes Library in Northampton, Mass.