Peaceful acoustic songs?

I'm looking for peaceful songs to play on my acoustic guitar. I'm looking for sad/peaceful/serene/calming/depressing (one or more of those options) ambiental acoustic music. I found one, This Is Your Home by Masashi Hamauzu, but am looking for plenty more of these background ambiental songs, because I love the mood they set. Does anyone have any suggestions? (Another example I found was CR14 music used in Minecraft, except that kind of music for a guitar. Most of the music I am talking about is the type of music usually found for mandolins and such.)