As I really enjoy the sound of an acoustic guitar (stumming and / or picking), I try to flag such songs with the comment 'Acoustic' in iTunes.
I have a smart playlist to pick up all of these songs ("Comment contains 'Acoustic'"). It's a nice mix - - some Beatles, James Taylor, R.E.M., folk, country, etc. The playlist seems pretty coherent due to the common instrument. You can also refine this playlist to include "3-stars or greater", etc...
I have a similar lists, but I have also added rules that look for the word "unplugged" and "acoustic" in the song title and album title fields, in case I haven't got around to commenting them yet.
I have a similar lists, but I have also added rules that look for the word "unplugged" and "acoustic" in the song title and album title fields, in case I haven't got around to commenting them yet.