I'm a big fan of the acoustic songs too man, and what comes to mind straight away is Kurt Cobain from Nirvana and their acoustic album called "Unplugged in New York" - an amazing album, where they do some originals and some covers. Here are a few songs from the album..

Yes that is David Grohl from the Foo Fighters on the drums in his much younger days..

I am going to do my Three Tunes Tuesday on this album next week man, thanks for the inspiration!