D is for downpipe

Or drainpipe.
A pipe that comes down.
These appear to converge into one, but actually disappear into the wall, and is all I could think of for this week's Alpha Ponty challenge. Especially when I have to find a song title that goes with it.
And there wasn't a tune with drainpipe in the title, and yes i did think of the Status Quo song, but I have no idea what a dustpipe is, and it certainly is not a drainpipe.