Mayfly was a Dutch prog-folk band founded in 1970, Bergen N.H. The band was initially named “Guruperide” before it changed to Mayfly in 1971.Members :Gustaaf Verburg (vocals, bass, guitar and piano)Onno Verburg (vocals, guitar)Ide Min (vocals and electronic instr.)Maarten Min (vocals, drums)Huub Nijhuis (bass, cello)Arie de Geus (piano and violin)