Basically what the title says! I just stumbled across Rimi Natsukawa's 2001 song 'Nada sou sou' and parts of it remind me of Ayu's 'Theme of A-Nation '03'! Mostly the vocal melody reminds me of Ayu's song, as well as the themes in the lyrics! Particularly the way Rimi kicks off the vocals at 00:29 seconds into the music video:
https://www.youtube.com/watch?v=HQtFsu3G9f0
Just wanted to share because I found it interesting
