Google's music streaming service is about to shut down for good. Here are 20 other Google products that bombed, died, or disappeared. (GOOG, GOOGL)

· Google has dozens of popular hardware and software products.
· But there are many Google innovations that have crashed and burned, or slowly petered out over time, like Google Glass and Google Plus.
· Google has killed off a few major products over the last few years, including Inbox by Gmail and Allo, yet another...