My babies used to fall asleep to concert band music. It's a good thing I didn't have to get my clarinet out and play my part to make it stand out more as it would have since it was being played directly over them. One performance, while I was pregnant, we had a local politician give a speech in the middle. My daughter was content the whole time I was playing but while he was speaking she was kicking like crazy. He was speaking on the radio again the next morning and she kicked so hard that the covers actually moved. She never reacted to his voice after she was born. It was very strange.