Sonic R - Can you feel the sunshine x Stevie Wonder - My Cherie Amour. Same chord progressions, same note. Also has the arpeggio from Marble Zone at 0:54.
Jun Senoue was sampling some red hot fucking fire. Super Cat - Ghetto Red Hot (Hip Hop Remix) Sonic Adventure - Red Hot Skull (Red Mountain) Just sample 4:11 to 4:15 and you too can add some red hot fire into your songs. Good fucking songs all around.
I love this thread, I wish I had seen it sooner... I've been making a playlist with a similar concept, although not all of these are soundalikes. Still, you may enjoy! And you may also notice toward the bottom/recent entries, I've added ideas generated from this thread. https://open.spotify.com/playlist/03xiwdc0jlLTyzY6OOaVpR?si=151e08128e024148
The beginning of the cutscene where Sonic first encounters Sage and Giganto has music very similar to a track from the End of Eva, down to the melody and everything. Coincidence or cheeky tribute?
It's more the instruments that are similar than the composition, and this is almost entirely based on SA2B and Sunshine being my two most-played Gamecube games when I was a kid, but there's this:
I was listening to this (at 1:30) and thinking: "It reminds me of some Sonic song." Then I remembered Studiopolis (starts at 0:55)