“Tank!” is a really iconic, memorable opening, largely due to the lack of lyrics. The opening relies purely on the music to carry it, and it’s an unusual thing for an opening to do. Despite how unusual it is, it is very befitting of Cowboy Bebop as a whole as well. It’s impossible not to find this song catchy and fun to listen to because of how driving and fun it is (even the characters are dancing along in the opening, so clearly it’s meant to be light-hearted and dance-like in nature).
Objection Network 
I actually never got around to watching Cowboy Bebop, but watching the opening theme for this anime is really stylistically done. The music definitely sounds great and the opening theme animation kind of reminds me of how the credits of a James Bond movie opens up. Hopefully I’ll get around to watching this anime, if my schedule allows it, haha! 🙂
I like the comparison with James Bond! It is a very unique opening that I, for one, wouldn’t mind seeing more of in anime. It’s unconventional, but that makes it good too! I would say the show is certainly worth watching since it’s revered as a classic. 🙂