In a move to keep the music streaming competition alive, Spotify announced it will be expanding its mobile service's free music library, including the songs of Led Zeppelin.

Daniel Ek, the company's co-founder and CEO, held a press conference at Spotify's Manhattan headquarters, the New York Times reported, to announce the changes. First, the music service will increase the limitations of free music for mobile device users, and second, adding the music library of the legendary rock band.

Spotify will now offer its wide range of songs on tablets and smartphones with a bit of a caveat. The tablet app will look just like the service for desktop computers, but the version for iOS and Android will be different. A user can shuffle all the songs of a certain artist without actually picking a specific song. However, the user can add songs that are played to a playlist to listen to on demand later.

"The world has changed a lot since we launched," Ek told the NYT after the news conference. "More than half of all users are now signing up straight to mobile, and there is a huge correlation between playing on mobile and getting people to convert."

Subscriptions for Spotify cost anywhere from $5 to $10 per month and eliminate ads from the listening experience. Spotify differs from its competitors as it acts like Netflix in allowing users to listen to its library of songs. Google Music allows users to upload their own music library to a cloud, whereas Pandora and iTunes Radio generate random songs based on musical preference.

According to Bloomberg, the addition of Led Zeppelin's catalog is a major win for the music service. Spotify has now secured two of the industry's most fickle and most revered rock acts in terms of music licensing. With Led Zeppelin and Metallica both in tow, Spotify will now appeal to a much broader audience than it already did.

Radiohead was among major holdouts that include AC/DC and the Beatles. Radiohead caved and allowed Spotify access to their catalog, while AC/DC and the Beatles remain in a stalemate with the music streaming service.

"I suspect at this stage Spotify is trying to move ahead of its competitors to try to maintain its dominance in the streaming market ahead of extreme competition," Andy Malt, editor of CompleteMusicUpdate.com, told BBC News. "Next year will be a make-or-break time for many."