I mean, even Google Home and Alexa could handle playing a song on Spotify by me asking for it a decade ago. It's baffling that wasn't one of the first things implemented in Grok for Tesla.
The built-in assistant already does a great job of this, so whatever they do with Grok they'll want it to be better in some way. Like, "help me find songs similar to..." or "help me find that one song by that one guy with these lyrics".