This appeared in my inbox, via Google. I have no idea of its provenance whatsoever. It’s a montage of DAB digital radio stations in London (taken yesterday allegedly, but there’s some inconsistencies there). The stated aim is to allow people to make their own mind up between the variety of services and the sound quality that they are broadcast in.
I’m not sure why it’s ordered the way it is (I couldn’t detect a pattern to the order), but most of the “big brand” stations are towards the end of the 15 minutes.
So go have a listen to what DAB Digital Radio in London sounds like, and make your own mind up.