I wanted to clarify my previous statement about arrangers being used in a professional setting. Some professional keyboard players actually use arrangers as sketching tools to quickly compose ideas for songs on the fly. In the event arrangers ever get used on stage in an actual live performance I realize they would need to turn "auto-accompaniment" off. A big name band might have to tape over the name on the keyboard as well. Tyros7 might cause an audience to riot. Covering the name would avert that potential scenario.

All the best, Mike