This is from the Pioneer Elite SC55 description
AirPlay is a revolutionary way of enjoying your music anywhere in your home, and the SC-55 is AirPlay compatible right out of the box. Wirelessly push music from your iPhone, iPad, iPod touch, or your iTunes®-running Mac or PC directly to the receiver so you can enjoy all your favorite music in your living room through the big speakers. Use your iPhone or iPad device’s familiar controls to change the volume and switch songs, all while viewing iTunes album art on your TV. And with the SC-55’s multi-zone capability, you can even enjoy your iTunes music in a second and or third room while you’re watching the latest Blu-ray Disc title in another.
I'm assuming the other brands (Yamaha, Denon, Marantz, etc) have like features.