music player

This may be a newbie question, but since I am one I’ll go ahead and ask. is there a good way to play the music located in my itunes folder on my NAS? basically I’m looking for iTunes style capability without having to have my MacBook on or iTunes launched. right now I can see all my music folders located within the iTunes folder on my NAS but I have to go through each subfolder to access my tracks. I’m hoping that somewhere there is a way point to my aTV to my NAS and tell it to shuffle and play my music.