I've been watching a lot of the anime Manga Mukashi Banashi lately. The opening theme song and the closing song is pretty cool. Since the beginning of the year, Nissan has been running a commercial that features a punk-rock version of the closing theme, "Ningen-tte Ii Na." The band that covers the song is called GaGaGaSP, although the commercial credits them as GaGaGaDX. Maybe they're in the midst of a name change? Here's the commercial:
And here's the original closing titles from the anime for comparision: