While there are some anime OP (or ED) theme songs I like, I can't say that I was really that gripped by the Negima! anime OP song, "Happy Material." If you haven't heard it, or don't remember, take a listen to the original anime cut of the song.
Hata recently discovered a jazz cover of the song, done by the Swedish jazz band, Platina Jazz, and produced by Rasmus Faber. I rather liked this take on the song. Take a listen.
The group has released three jazz cover albums of various anime songs, the latest being released February 8, 2012. The only official site I could find for the group is Victor Entertainment's page (in Japanese).
If you want copies of their music on CD, it has to be imported. YesAsia does have all three CD's from Japan, though for some reason, they don't show the actual CD cover art.
- Rasmus Faber Presents Platina Jazz - Anime Standards Vol. 1
- Rasmus Faber Presents Platina Jazz - Anime Standards Vol. 2
- Rasmus Faber Presents Platina Jazz - Anime Standards Vol. 3
If anyone buys these albums or already owns them, let me know.