Umeko Ando
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Umeko Ando (安東ウメ子 Umeko Andō?) is an Ainu (Native Japanese) singer who died in July 2004. Episode 17 of Samurai Champloo bears a message regarding this at the end of the credits, reading simply:
Umeko Ando
May her soul rest in peace.
It is likely that some of her music was used in the show as the Ainu style was used in a few episodes briefly before this point in the series.