Hi Terry,
One last idea. It used to be you'd build an MP3 player from an MCU and
a $7 MP3-decoder chip. The Pi Zero could replace the former and should
be up to flinging SPI data to more than one of them.
http://www.vlsi.fi/en/products/vs1011.html
http://fun4diy.com/CCS_MP3.htm
https://www.sparkfun.com/products/8126
Cheers, Ralph.
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