It took someone with a lot of time on his/her hands to do that. Amazing. Beautiful run, most of the tunes you could actually recognize.
I think the timing must have taken even longer.
Graham, I think the actual noting would take the longest. Different size glasses need different amounts of water in them - and think of the evaporation ruining your tuning under those hot camera lights! These guys obviously have LOADs of time - check out the layout it's on. That's thousands of hours of work.
