The wonderful Scottish singer Lizzie Higgins, daughter of Jeannie Robertson, used to sing this song. She called it 'Aul Roguie Gray'. She sings it on her Topic album 12TS260, 'Up and awa' wi'the Laverock', where it is credited to Charles Lesly, of Aberdeen, who died in 1782 at the reputed age of 105. Amazingly the song entered the pop world in the 1950s when Doris Day and Johnny Ray recorded a duet version they called 'A Girl is a Girl'. This is from memory, so it could have been 'A guy is a Guy'. The chorus ended 'Listen and I'll tell you what this fellow did to me'. I'd love to hear Kevin Mitchell sing it. he is one of the greatest around these days. BTW 'Laverock', pronounced 'Layverock', is a dialect name for the Lark. Lovely word isn't it?