This is the new Centre for Political Song, established at the Caledonian University, Glasgow, funded and supported by Janey Buchan MEP, from the collection of herself and the late Norman Buchan MP.
Haven't seen what they've got, so can't answer for the width of material - what were the lyrics of the Goeoge Michael song in question? Some 'pop songs' have politically committed and explicit lyrics, don't they? And Eric Bogle's WW1 songs are considered to be 'political' although I've never met anyone in favour of WW1.