Pink Floyd were an English rock band formed in London. They achieved international acclaim with their progressive and psychedelic music. Their most famous song I would say would be 'Dark side of the moon'
My favorite Pink Floyd song is "Time" - and tells about time slipping away, but most people do not realize this until it's to late. Roger Waters got the idea about this realization that takes place at 28 or 29 years of age, when you are no longer preparing for things in life but right in the middle of it - which I can relate to as well. Check out this street musician in Rome playing this song - he has over 4 million views.