Dances with Dogs has the story, "The Story of the Deathless Voice". I spent a bit of time looking for information about this and then I found the Wiki article. Link: http://en.wikipedia.org/wiki/List_of_Wishbone_episodes . It has "Song" instead of "Story" at the Wiki.
This link seems to have a part of the story: http://www.questia.com/PM.qst?a=o&d=609653 . However, they want to pay/subscribe to read the rest of it. I hope that helps is some way.
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