I spoke to all of them. but the weird thing is i still have the horn in my inventory and I am done talking to arngeir. the rest is all gathered around the place where there is supposed to be a summoning so i can learn the word. and all of them just bow and move their arms and go back to standing when i press X to talk. and arngeir himself is stood somewhere else saying the same thing.
Happened to me too, what i did and it worked, for 2 quest i thought broken, i saved the game(after talking to arngeir) then i shut off the PS3, waited 30sec, then start the PS3, the game, loaded my game, talk to arngeir and it worked.
Dunno if i was lucky, but it worked with 2 differents quest( Main Quest ... other one was with SPOILER ALERT
Spoiler I wasn't able to read the Elder Scroll on Throne World
But after i did what i just said, both worked, so i hope it will work for you.
Now, BETH if you please, fix the damn framerate......