the thing I find most frustrating about the music use-case is that if you ask it to play an album, then close out Siri after the confirmation bing noise, but before it finishes reading back to you the artist and album name it's about to play, then it will treat that as a cancellation and it won't play the album.
for example I say: "play comically long album title by artist on Spotify", it thinks about that for five seconds, does the bing noise, then says "playing comically long album title [special remastered edition] by artist on Spotify", and then a few seconds later starts playing the album, and if you don't wait through that whole thing it will just decide that actually you didn't want to hear the album