Billboard.com's web site describes two new box sets coming out in
June, one of Johnny Cash recordings, the other of June Carter. And I
quote:
"The Legend" will span four discs and 107 Cash tracks, covering 1955-
2002 and all of the Man in Black's major recordings for the Sun and
Columbia labels. Seven of the included tracks are previously
unreleased, including "It Takes One To Know Me." That track was
written by his wife's daughter, Carlene Carter, as a teenager, and
recorded in 1977. Carter recently added vocals to the recording that
appears here.
http://www.billboard.com/bb/daily/article_display.jsp?
vnu_content_id=1000818087