Amazon on Wednesday rolled out its Music Unlimited cut-rate subscription streaming service, available on its Echo, Echo Dot and Amazon Tap devices for as little as $4 a month for a single device. Setting a low-entry price point "is a logical move, given that the company has invested heavily into the AI and voice recognition powering Alexa in its move to catch up to Google in those areas," said Paul Erickson, senior analyst for the connected home at IHS Markit. Amazon "needs to incentivize potential Echo owners as much as it can," he said.