What president was buried in a piano?

I forget the exact details, but years ago I heard that the hugely-corpulent W.H. Taft was buried in a coffin that either was an actual piano-case, or was the size of a piano-case.

He also supposedly got stuck in the White House bathtub, but that seems to have just been a "presidential myth" like the infamous "Little Georgie Washington and the cherry tree" tale. He apparently did messily overflow a hotel bathtub in Cape May, New Jersey, though, not realizing how much his enormous bulk would displace the water.