In the US, it’s not illegal, as long as you got it from YouTube and it’s not copyright strike or reuploaded for monetization. Converting a sound to mp3 isn’t torrenting or pirating, so you’re safe. Check internet laws in your country though just to be sure if you’re worried about it.
Not only that. The existing artwork screams to be on a full album cover. http://www.amazon.com/Cowboy-Bebop-Various/dp/B000058A76
In the US, it’s not illegal, as long as you got it from YouTube and it’s not copyright strike or reuploaded for monetization. Converting a sound to mp3 isn’t torrenting or pirating, so you’re safe. Check internet laws in your country though just to be sure if you’re worried about it.
Edit- you can also buy on amazon if you want to own a physical copy.
Maybe I'm misunderstanding something, but the original Japanese CD version is only $20 on Discogs and from ¥864 ($7.90USD) on Amazon JP
Is the Taiwanese bootleg special in some way?
Start with the first one, normally nicknamed "Red". It looks like this