Lots of blues and slide (Robert Johnson, etc) is done in open G and its cousin open A. Open G (taro patch) is one of the primary slack-key tunings. I play about 20 slack key songs in open G and should really work up a dozen or so blues and slide tunes to mix in.
Things like Elizabeth Cotten's
Spanish Flangdang come to mind. There is a lot of instructional material of Stefan Grossman's DVD's. LA singer-songwriter Peter Case plays almost exclusively in Open G. At a workshop once he showed us
Yesterday which requires just one easy chord formation for Em, and the rest is barres. And I heard
Puff the Magic Dragon done slack-key style on Kauai in open G once, and had to go work that one out for myself.
I avoided alternate tunings for years, not wanting the hassle of re-tuning all the time. (As with anything else, more practice makes re-tuning it easier and quicker). The tune that finally got me to take the plunge is an African tune called
Sangisangy. A YouTube search will bring it up easily enough. It appeared on one of the Acoustic Guitar magazine CD's back in the day, with tab appearing in the March 1998 issue. At first listen to the CD I had to learn it, but my heart sank when i found the tab and discovered it was in open G. I got over that.....
![Cool 8)](http://www.unofficialtaylorguitarforum.com/Smileys/default/cool.gif)
and
Sangisangy has become one of my favorite instrumentals to play, especially if my guitar already in open G tuning. Now I play slack key in six different tunings, so I have really gotten my initial reticence.