Yeah I had the same thought about initial default value for song language ;) I also thought about voting but I don't think many users would be involved so to begin it could be as simple as just subjective assessment of the author. There could be some guidelines like a list of some songs for each difficulty could be prepared by forum community. Eg. ' rate your song 100% difficulty from 1 to 10 if 2 is What i've done by Linkin Park, 9 is Lynyrd Skynyrd-Free bird, and 10 is hell' ;) Of course difficulty is always subjective matter because for one player eg. switching barre chords can be a piece of cake, while other guitarist still struggles with it but performs quite well at solos. But this measurement would be still better than nothing, don't you think? :) From my point of view: When I check on forge updates usually just the bands I know catch my eye, but if I saw a difficulty rank saying the song is '4' I would think, hey I am still a beginner and maybe I will learn something on this song, let's check this out' :) And from the other side if experienced guitarist saw 8-10 rank he/she would maybe think 'hey , this could be challenge !'