Samurai Champloo
Samurai Champloo aired in 2004, seven years after Cowboy Bebop, and the comparison was unavoidable because Shinichiro Watanabe directed both. Bebop used jazz to build a future out of old movies. Champloo used hip-hop to take Edo-period Japan apart and put it back together with a rhythm nobody else would have trusted. Nujabes, Fat Jon, Force of Nature, and Tsutchie did not merely score the show. They gave it a pulse.
This was also a perfect fansub-era recommendation. Twenty-six episodes, a complete story, no franchise homework, and an opening episode you could hand to almost anyone. People came for the sword fights and stayed because Fuu, Mugen, and Jin gradually became a family none of them would ever admit they needed.
The baseball episode is still funny. The ending still lands. The soundtrack never stopped being essential.
Guides and reference pages for this series. More coming.