Hi,

In the US the song has to have been documented before 1923. If you use someone's arrangement it is probably copyrighted. When I submitted a list of songs to my publisher they checked on them and red flagged several and a couple others that were questionable they admitted. In truth- they did not really know- in fact they call me when they want research on a song. This is a major publisher.

Looks like you're good on everything but "Steam-Powered Airplane" which you need to check a see where Hartford got his version.

Almost every folk song has been copyrighted many times (original copyright plus subsequent arrangements)- so checking copyrights doesn't prove whether a song is OK.

Richie