Oh boy. Time to dust this thread off once again.
Let's just take a moment to talk about Sonic Mega Collection. I don't think I've seen the music for this compilation listed anywhere in this thread.
Whilst every song in the game is pleasant, 3 songs in this are simply sublime. They are as follows:
and finally, this piece of audio-gasmicness.
This last piece... This last piece of music just gives me a true warmth every time I listen to it. I even remember when I first got 'Mega Collection Plus' on the PS2 and went to the game select screen for the first time and heard this. It was somehow the most nostalgic song I'd ever listened to even though I'd never heard it before.