If you've never heard of a fugue before, it's a kind of musical composition that is similar to a canon like "Row, Row, Row Your Boat," but instead of each voice following the exact same melody with a delay, the voices only have to start out with the same melody and can then evolve in complex ways that obey the laws of counterpoint. The most famous composer of fugues is Bach, who wrote two full sets of fugues in every musical key in his great works, Books 1 and 2 of the Well-Tempered Clavier. So it was only natural that I ask GPT-6 (aided by my AI music theory system, a Rust CLI tool called mtdt, together with an agent skill library comprising ~330 skills) to make a fugue in the style of Bach. But what melody to use? I wanted something nice and recognizable that was still simple enough that it would work well for a fugue. It can't be too long, and it's better if it has a certain kind of simplicity that makes it easier to combine with altered versions of itself at various delays. I ended up choosing John Williams' theme from the movie Home Alone (called "Somewhere in My Memory"), and I think it came out really well! If you're a fan of the movie and Bach, you couldn't ask for much better than this for a mash-up.