For recording a song or tune, what you really need to find out is who owns the rights and whether or not you need to obtain a mechanical license. (Search the forum for exhaustive discussions on the topic.)
The licensing agent for most U.S. music is the Harry Fox Agency, and they have a public song search feature here:
http://www.harryfox.com/songfile/pub...blicsearch.jsp
I checked on "Gimme Back My Fifteen Cents" and it returned no results. That isn't necessarily conclusive evidence that you can go ahead and record the tune without a license, but it's a good start.
"Gold Rush" is listed as a Bill Monroe piece. It wasn't unusual for Bill to get the lion's share of credit for songs and tunes his bandmates helped work out or even composed outright.
To see if a song or tune is already acknowledged as in the public domain, try:
http://www.pdinfo.com/
A search there also resulted in no hits.
A search at the Folk Index attributed the song to the Binkley Brothers' Dixie Clodhoppers, but didn't indicate writer, copyright, or publishing rights. That wouldn't be unusual for old-time songw, many of which were based on or cobbled togther from older songs.
http://www.ibiblio.org/folkindex/kwframe.htm
A few more good-faith efforts with no results would probably suffice for you to attribute the tune to public domain.
Good luck.
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