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great Idea! just one caveat you might want to include - you need decent WiFi to play music with the echo, if somebody lives in the boonies where they barely get enough signal for a phone call, it won't work properly. If the signal isn't there, it just isn't there, and the echo dot requires a decent WiFi connection.
Casting In Pre-made Molds
Mixing + Pouring Concrete
The Dearthbox: A low-cost, self-watering planter