Historical clue formulations

• Gene, the singing cowboy — 2017-06-27
• See 12-Down — 2017-02-12
• Cowboy singer Gene — 2016-10-11
• Gene of westerns — 2009-10-07
• See 57-Across — 2009-08-08
• Cowboy who rode Champion — 2008-10-29
• "Tumbling Tumbleweeds" singer — 2006-06-16
• "Mexicali Rose" singer — 2003-07-11
• Singing cowboy — 2002-11-26
• "Tumbling Tumbleweeds" singer, 1935 — 1994-07-05
• "Here Comes Santa Claus" singer — 1994-03-27