I literally asked my Google home this morning: "Hey Google, play some Peruvian psychedelic cumbia" and it found exactly what I wanted (using Spotify). For me, these home assistants are the best thing I have bought since my first smartphone.
Doesn't that violate streamed discovery and all that? You should just be thumbs up thumbs down and trust the streaming service to take your advice as it DJs to you. "Alexa play what you think I need to hear"
