Originally Posted by Raynor

The ainur used their free will to compose their music, so they must have had conscioussness. That they were good before Melkor's discording music is an fundamental idea in the Legendarium. I don't know of any 'evidence' concerning the level of their happiness, but even in this 50/50 situation, I believe it is safe to speculate they were doing quite alright. Ainulindale speaks of them experiencing amazement, harmony, communion, awe, even if only in relation to the music.