In this video Beth Patterson explains the tuning GDAD of her bouzouki. She gives some examples of the advantages of this tuning.
On this video she sings a few songs and talks to her students
Here' s the song Apona
The song Quicksilver
The White Hare of Howden
Musique a Bouche
Look at: http://www.artistshousemusic.org/videos/musician+beth+patterson+on+tuning+and+playing+the+bouzouki