If they know some traditional Christmas(religious) music then they should be ok. Most of the music is Christmas music that we listen to at home and in the car. That being said, the past 2 times that we have taken dd(age 3) she has fallen asleep both times. We went to the 8:15 show and after a long day of walking around, she just fell right to sleep. We will see how this year goes since we will be bringing our 8 mos. old for the first time. I think it is important for children to gain an appreciation for good music and so you can just prepare them ahead of time and tell them that this is a time to sit still and to listen to the pretty music. We also brought a lollipop(dd favorite) just in case we needed it.