With its Songza deal, Google could end up dominating other streaming music services if it becomes the default option on Android mobile devices.
That's both because of Android's dominance among mobile devices and Songza's ability to curate and recommend new music to its users, according to Dan Costa, editor-in-chief of PCMag.com.
"Streaming music services are booming, particularly among younger consumers," Costa said. "Google is a big player, but its music offerings have been subpar. Songza should give the company a much-needed lift," he added.
Android devices make up nearly 62 percent of the U.S. market for smartphones, according to Kantar Worldpanel ComTech research as of May 2014.
With the Songza move, Google pits itself against Spotify, Pandora and Rdio as well as Apple, which acquired Beats Music and its streaming service, as well as Amazon, which recently for its Prime customers.
While Google has said it doesn't plan to make any immediate changes to Songza, the service could eventually be more integrated with Google user profiles, Costa said.
"Of course, Google will have access to all of your music preferences. That could be a win for its advertising business," Costa said.
—By CNBC's Althea Chang