Strange 'ice cream van' music?

I live around Kenilworth Road. Have been hearing some incredibly off-kilter music that sounds like it's from some kind of ice-cream van- it sounds like a short snippet from greensleeves, though off-key, like the way music sounds from a device with a dying battery. It is incredibly loud and incredibly creepy. I tried looking out my window when it sounded like it was right outside but couldn't see anything. Is this an ice cream van? Has anyone else heard this?

Also unrelated but related, a week or two ago I heard what sounded like a man shouting something unintelligible in the morning, kind of sounded like he might have been selling something but couldn't tell. Again, incredibly loud at one point but couldn't see anything from out my window. I mention it because both cases seemed to have the 'noises' taking the same route, coming from far away, then incredibly near and extremely loud, then I could hear them for what seemed like far away after that, all for several hours.

Any idea what either of these are? It's a bit frustrating too as they are very noisy.