Midges are not a problem until late April at the very earliest (and Avon Skin-So-Soft Original Body Oil keeps them away!). The West Coast and the Islands are beautiful. I would recommend the Isle of Arran, known as 'Scotland in Miniature', in the Firth of Clyde, easy to reach from Glasgow via Ardrossan, and I believe there are folk music gigs in various establishments on the island.