From the Producers:

An ACL Television Taping is a unique experience. Remember, on taping night, you are in a television studio! While the audience energy is similar to any live concert venue (and we encourage this enthusiasm) - it is important to note some key differences. With our cameras rolling, it's crucial that you are in your seats 15 minutes prior to show time. Once the taping begins, cell phone use (including photos, texts, etc.) is prohibited. Please limit talking as audience noise is picked up by our microphones and can affect the quality of the final program. Likewise, empty seats are captured by our cameras so please limit visits to the restroom and/or lobby bars to in between songs. We thank you for your cooperation!