What I loved about the Bebop opening is how it easily calls upon the design work of individuals like Reid Miles, in their prolific cover art done for companies like Blue Note Records.
Spencer
This opening really says it all. It introduces this masterful anime with a great blend of big band jazz and CG that you normally don't see in these kind of series. The moving text in the background and the characters in front make for a great way to introduce the characters and setting. It's just enough to set the tone while still leaving you in the dark. You know that there is going to be a lot of shooting involved and that's about it. And yes "Tank" is what makes this one of the best openings I have seen in an anime. I love seeing Spike lighting up his cigarette in the beginning. Its one of those images you remember clearly when you hear about Cowboy Bebop. But what I want to know is...where is Ein in the opening!!!
Miguel Valdez-Lopez
Iconic!. Very "Dr. No" and "Wild Wild West" (the TV series).
Van
Obviously, "Tank" is an incredible title song for Bebop, setting a tone as well as a standard for the next 25 minutes of Kanno Yoko's soundtrack. That said, what I find most appealing about the sequence is the Bond-esque foreground shadows over mono-colour background. It gives an ambiance of just a bit of old-school craftsmanship that is evidenced by the quality of the vast majority of this series.