Ian Anderson (of Jethro Tull), frequently uses a capo for his more acoustic-flavoured songs which, along with his strumming and picking notes within chords technique, gives them a unique signature tonality. The chap in the attached video makes a pretty good fist of a Tull tune that could easily be transposed but crucially wouldn't sound the same, despite the transposed chords being made up of the same notes, albeit in a different shape:
https://www.youtube.com/watch?v=uKnEZ9qotUg
And the man himself:
https://www.youtube.com/watch?v=HlE2DjOX2FE