Will Apple TV operate in "Airplay only" mode ? (can it connect on an Airplay network without a wireless access point?)

I've tried to connect my Apple TV to an existing Airplay network, but the connection always fails. The Airplay network consists of my iMac and an Airport Express and streams tunes from my iTunes library without using my ISR (intergrated switch router with wireless access point). I'd like to be able to use the Apple TV in "Airplay only" mode to stream music without having my internet connection active.

Apple TV

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