Have you ever heard the Crosby tune Lee Shore?  Exquisitely beautiful; hauntingly so.  It's on the live 4 Way Street Album (CSNY).  I loved the acoustic sides on that album.  Didn't ever care for their electric sets. 

Guinnevere is another great one.  I'd love to know what kind of guitar tuning he used for that one.  It's altered or open, but I could never figure it out. 

G