The 101 Plays Itself is a live Caltrans camera pointed at the southbound 101 in Studio City, where every car that crosses the line plays a note, so what you're listening to is whoever happens to be driving through Studio City at that exact moment, with the music assembled in your browser as they go past. It sounds a bit like a theremin under glass, which is a strange thing for five lanes of LA freeway to sound like, and considerably calmer than anyone who has sat in that traffic would expect. There's no use for it whatsoever, which is sort of the point, and I've had it running in a tab since I started writing this.

SmartPause sorts out the thing where you tap play/pause to stop a YouTube video and Apple Music opens instead, which happens because macOS sends that key to whatever it last remembers rather than whatever is currently making noise. Yasin's fix is to ask Core Audio which app is actually outputting sound and send the command there, and if two things are playing at once, one press switches between them and a double press pauses. It's free, open source, lives in the menu bar and asks for a single permission, and it's a fairly small fix for something that's been quietly irritating me for about ten years.