Believe
Sneaking away from Yoh's house to rescue Ren, Yoh, Manta and HoroHoro meet a duo of Shaman singers, whose technique sends spirits to the other world.
Aired 21/11/2001EP 21 - Believe

2001
Shaman King
Shamans possess mysterious powers that allow them to commune with gods, spirits, and even the dead…and Manta Oyamada's about to learn all about them, because his class just welcomed a new transfer student: Yoh Asakura, a boy from way off in Izumo…and a shaman in training!
(Source: Kodansha USA)