My wife and I bought ourselves Apple watches for Christmas, and since then, I’ve been using the watch as the source of music for my workouts. Convenient, though I have to take it off to use straps for DLs etc. Anyway, the other day at the end of my playlist (mostly Linkin Park, Green Day, and some other stuff sprinkled in), it started playing random songs NOT IN MY PLAYLIST based on the songs in the playlist. The Offspring, Modest Mouse, lots of 90s music. The algorithm hit perfectly, unlike Pandora which frequently misses and just repeats previous songs. It was a great way to workout to music I liked, but was fresh and different.