Two Impromptu Arrangements

Yesterday, as I realized that it was coming upon Wednesday and I hadn't prepared a song to record, I decided I wanted to do something different -- an impromptu arrangement. You know, just sit down and play (okay, so maybe I did actually figure out the chords for "O Come, O Come Emmanuel" before hitting record...).
I asked my FaceBook friends for suggestions and got several responses. I had so much fun doing one that I decided to do two on the fly. ;) Here they are.
What songs would you like to...