The music thing is not necessary to finish the mission. I have no idea what do you get for completing the music challenge (I could never do so). Just go on with the mission.
Satan said:
"You are for ever angry, all you care about is intelligence, but I repeat again that I would give away all this superstellar life, all the ranks and honours, simply to be transformed into the soul of a merchant's wife weighing eighteen stone and set candles at God's shrine."







