If you can't find Glocca Morra on any map, that is hardly surprising because along with Missitucky from the pen of the same author, it does not exist. Actually, as of October 2013 there were a dozen or so entries on Google Maps but they were all guest houses and such.
"How Are Things In Glocca Morra?" is a downtempo song in 4/4 time from the 1947 stage musical Finian's Rainbow; it is the second song in Act I (excluding the overture) and is performed by Sharon McLonergan, who is the daughter of Finian McLonergan, around whom the show is built.
Like the rest of the music in Finian's Rainbow, "How Are Things In Glocca Morra?" has music by Burton Lane with lyrics by E.Y. Harburg; the book is by Harburg and Fred Saidy.
Suggestion credit: Alexander Baron - London, England