Jun Senoue, Kenichi Tokoi, and Fumie Kumatani on Sonic Adventure Vocal Mini-Album:

It Doesn’t Matter …Theme of “Sonic”

Senoue: This is a song that utilized Tony Harnell’s range of voice. I made the song with him in mind for the vocal since the beginning. The studio where I have done the mix in L.A. is the historic A&M Studio and the impression of carrying out the job there is great. Speaking of unforgettable experience, the time when I recorded the guitar solo was over 6 a.m. and I was exhausted!!

Tokoi: When I listen to this intro, it is exactly Sonic … inside me. Tony’s highly clear voice is comfortable.

Kumatani: I so consider Tony Harnell’s voice really good, but how do you think? This song just won’t leave from my mind.

[Source]