A typical school extra-curricular club that in the 60s - early 90s used to be very nerdy and uncool. Now, AV has become very advanced, you get to learn about the recording industry, getting students ready usually to get a good college for audio recording. Jobs include running live sound for concerts and plays, and lighting design. Can be a very rewarding experience. WARNING: May lead to catching the [audiophile] fever.
* These videos are coming directly from Youtube, they may or may not be most relevant to the word "Audio visual"