Building an audio room - 12x22 - electrical plan?

I am at the pount of adding a new room which will be my audio room. It will be 12x22 feet with the audio on the short wall. While I would like to Go wider than this I do have size limits that I have to adhere to. The contractors will be adding electric to the room and I have not yet decided what to request. Based off of what I have read I am assuming that 2 20 amp circuits are the way to go. Any other recommendations? I am looking to add things now that will be easier done during construction then down the road.

I will also be adding a layer of Homasote sound barrier to the sheetrock to keep me toe tapping to myself. The floor will be carpet. Any other items to consider up front?