TikTok is the modern MTV because (1) it increases consumption of music tracks that go viral on its platform as sounds and (2) any number of songs will forever summon the accompanying meme and visual choreography from my memory.
The thing I find most interesting about this for TikTok is how it can bring back an old song with new visuals. The scene kid revival, Fleetwood Mac's Dreams, etc. Music of youth endlessly young.