Amazon Hopes Alexa Will Offer Traction for Music App

Amazon.com Inc. is hoping that the virtual assistant that has made its Echo smart speakers a hit will also attract more users to its mobile music app.

The online giant said it would launch Alexa on its Amazon Music streaming apps on Tuesday, as it seeks to differentiate itself from rivals that have bigger shares of the competitive market. An on-screen button will let Amazon Music users access the various Alexa “play” commands that...