Re: The Rain Song - DGCGCD Tuning
Interesting. The 1991 Warner Chappell Music transcription tabs out all of the guitar parts for that song in standard tuning.
In this book, wherever non-standard tuning is used, it is indicated by both the actual notes and the deviation from standard concert pitch. e.g. Bron-Y-Aur Stomp = CFCFAF = -4 -4 -2 -2 -2 +1. Friends = CACGCE = -4 0 -2 0 +1 0.
My favourite place to look for alternative tunings is the Joni Mitchell website.