Black/White raven:

"It is Summer/Winter. Each player takes 1 more/less gold token when he or she counts income."

The raven's song

"Any effect that would make it Summer or Winter is considered inactive while The Raven's Song is revealed."

The question is: Is the whole raven's effect cancelled by the raven song (and we take the normal amount of gold) or is just the season cancelled (and we apply the other part of the effect) ? We could say that "It is Summer/Winter" and "Each player takes 1 more/less gold token when he or she counts income" are two distincts effects...

EDIT: Oops, I answered this incorrectly at first because I was thinking Summer/Winter is distinct from income modification (which is true), but this plot makes the whole effect causing Summer/Winter inactive. There is a ruling in the FAQ about distinct abilities/effects on characters (there is a similar ruling for events):

Some character abilities may have two or more
completely separate effects, each with its own
play restrictions, cost, or targets. Separate
effects will always be separated in a different
paragraph. Treat each separate effect as its
own card. Unless the character card specifi-
cally says otherwise, one effect has no impact
upon the other.

I know Arthur Lannister won't like this ( ), but my guess is that this principle should be applied to the text boxes of all cards in play. Since the income modification parts of the ravens' text boxes are in the same paragraphs as the "It is Summer/Winter" lines, the income modification is part of the same effect as the season setting effect and it will be made inactive by The Raven's Song.

Well, as written, Arthur Lannister is correct. The gold counting effect is not dependent upon the season. And the fact that it is in a different sentence makes it a separate effect (yes, I know the FAQ says "paragraph," but let's not go overboard with literality here). Going just by the text of the cards, the two are not dependent, although they probably should be.

In all honesty, this almost never comes up in practice because "The Raven's Song" sees so little play.