when Speed Racer debuted, this is what it sounded like. when Speed Racer was re-released later on in the 90s on VHS and then later on DVD, the credits were changed a bit. for one thing, the original song is a bit slower than what we get now. there's some other differences, you can see for yourself!
not that it makes much of a change. I used to think it was because the episodes were slightly time compressed. then I heard it was something else altogether, which I have now forgotten. but at least we have it here on youtube.