K-pop seems to be in a perpetual golden age, with joyful new bops released almost every day—but its roots go back a couple of decades. This playlist celebrates those energetic '90s idol groups and soulful 2000s singers who laid K-pop’s foundations with tunes inspired and influenced by hip-hop, dance music, classical, and so much more. Our editors regularly update this collection with new tracks—if you hear something you like, add it to your library.