Who doesn’t know the feeling? Something brings back the memory of a song you haven’t heard since 2009. Back then it was playing on TV all the time. You look it up on YouTube. It totally has those 2000s vibes. All the comments are also “omgz I just remembered this song after 15 years !!”.
What even is the name for this phenomenon? Is there a community to share this stuff?
Colloquially a “blast from the past”
That phrase is a blast from the past