The answer was, you knew it, Dave Gilmour. That distinct Pink Floyd guitar sound.
Now I can here you all shouting 'but we've had Pink Floyd twice before on the FMS', and you'd be right. But as tomorrow marks the 40th anniversary of the release of 'The Wall' I couldn't pass on the opportunity to feature this. And as it is solo Dave Gilmour, so strictly speaking not Pink Floyd, though the track is of course, from 'The Wall'.
In October 1971 Floyd performed 'Iive' in the ancient roman amphitheatre at Pompeii. Returning there in 2016 for a very different experience 'Live at Pompeii' was a cinema release, tv programme, CD, LP, DVD and download. Track is: 'Run Like Hell' 
WARNING: Lots of flashing strobe lights (you'll need your Dave Gilmour type dark glasses ON) - especially if you go for the full screen option and it's a blinding ending with fireworks.