It's SIMILAR to a dirge written by Chopin (third movement of Sonata number 2), but it's in a different pitch and has slight variations here and there. I don't think it's an exact performance of any classical piece.
(For those unfamiliar, it's a commonly heard dirge and has been used at almost every state funeral...hard for a non-musical person to describe here, but it's used a ridiculous amount and is the standard song played in cartoons when it looks like someone died.)
"Teacher says every time William Regal refers to someone as 'sunshine,' an angel gets its wings!"
Never heard of a tie-in between the two (and I had heard of Howard before), but I'm not entirely sure. There's no way, though, someone who wrote a Simpsons episode could have the same bloodlines as someone who wrote the Super Rosey sketches....