The Recording Studio
The Recording Studio is located aside the Apollo's Cabin on Camp Half Blood. It was a gift from Apollo to his children. Here the Apollo Cabin and other demigods with permission from the Apollo Cabin can record music and make records. It is a small building with a big sign saying "Apollo Recording Corps". Inside is a sound booth and an editing panel, inside the sound booth is an enchanted cupboard that can pull out any instrument.
There's a note taped to the door.