Freight Train
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https://www.youtube.com/watch?v=5s_yumYPFm4
If Joan Baez sang her grocery list, I would sit and listen to that. But she probably also takes the easy way out playing this song.
https://www.youtube.com/watch?v=F_wrFI-Kbxk
It was written in the 1900's by Libba Cotten, who played guitar upside-down like it's the only natural way. He singing voice is not really charismatic, but oh! that guitar.
https://www.youtube.com/watch?v=43-UUeCa6Jw