Question: "Hello Vietnam" is the title of a song written by Tom T. Hall, the single, with backing vocals from Wright's wife, Kitty Wells, an American pioneering female country music singer, passed away on which date?
Sentence (from "Hello Vietnam"): The single, with backing vocals from Wright's wife, Kitty Wells, was Wright's most successful release on the U.S. country music chart as a solo singer.
Relevant evidence: Yes