I'd managed to get
(2) Orange Blossom Special
(3) Hackberry Ramblers
(4) Nutting
(6) Ram
(7) Oranges and Lemons
(8) Manchester
(9) Hard Times
(11) Lagan
(12) Long Lankin

Stumped by (1) which had to be a J and (10) I first thought of Mallow, but I assume now that the town was Fermoy - although I still don't know the tune.
I must admit I was trying to think of a more universally known author.