While some peo­ple play air gui­tar, I con­fess to air vio­lin moments. Ide­al mate­r­i­al for this innocu­ous pas­time: The Lev­ellers, Peat­bog Faeries, and Cor­nish trio 3 Daft Mon­keys. I first dis­cov­ered them at Tow­ersey in 2011, fol­lowed by an autumn gig at the Half Moon pub in Put­ney. And here they are back again, two…