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Google is discontinuing the Chromecast line
(www.theverge.com)
This is a most excellent place for technology news and articles.
Ottercast, but you gotta build it yourself!
https://github.com/Ottercast/OtterCastAudioV2
Pi zero + squeezebox + usb sound card
Squeezebox has been through several names through the years. It's now called the "Lyrion Music Server."