Joe took a moment to orient himself in William's dream, to adjust the thousand small differences in thought and perception. Things always seemed canted in odd ways slightly when he first got into someone else's head; it was an oddly physical and tangible sensation, considering they were dealing solely in the realm of the mind.
Slowly, he he grasped the music playing from the other side of a door, though the rest of the room remained blurry. It wouldn't solidify until William decided to make it solidify, but Joe wasn't bothered. He could feel solid floor underneath his feet, which was a whole hell of a lot better than when he went into a dream of flying or falling and wasn't expecting it.
"That's cool," Joe said with a slightly smile. "Whose playing the piano?"