Flu shots for everyone, funny story

Well everyone in the Day house hold has gotten our flu shots. Edward went today to get his, and before he got it he played a little in the waiting room, the doctor has a cool little house for the kids to play with. (See picture below). He didn't seem to like the flu shot once he knew what was going on, but we calmed him down. 

Know the funny story . When we picked Edward up at daycare they told us, when they were playing music today for the kids, Edward started dancing around, them all of a sudden a slow song started and he looked upset. They asked him if the music was too slow, he nodded yes. Then they asked if he wanted a faster song and he nodded yes again. They were so excited that Edward understood what they were asking and responded! Can someone tell how he has a hearing lose????