Where can I find the folk songs?

Hi, David, Absolutely loving the site, LOA, and the structured lessons. Quick q:In the Tongue Walk Study: Walk With Me Chorus 1 lesson with Hob Bosold, at around 6:35 into the lesson you explain that Hob might want to experiment with playing some folk tunes, and you speak about going to tongue blocking study 1.5, and what we're going to find are folk tunes e.g. amazing grace, america the beautiful, are you sleeping, goodnight etc. 

I wasn't able to find these folk songs, and would be v grateful if you might be able to help me with finding them.Thanks,