From what I can deduce from context clues across the series' songs, Back in Time from Sonic R might've been the first song in the series to have been sung in Sonic's perspective. Man, imagine you're Tails or that eggrobo and that hero guy you all thought was mute suddenly started talking, but his first words were:
"What am I doing here. There's no clear reason. Please, send me back in time, I don't wanna be here-"