anticipated digital music store Wednesday, opening a new front in its battle with Apple to provide services over mobile devices. For the first time, Google Inc. will sell songs on the Android Market, its online store for apps, movies and books. The service is available over the next few days to customers in the US, but it aims to roll it out eventually to some 200 million Android users globally. Some songs are free, while others were priced at 69 cents, 99 cents and $1.29 — the same prices as on Apple's iTunes. Artists whose work is available right away include Adele, Jay-Z and Pearl Jam. The store will feature dozens of free tracks from artists like Coldplay, Rolling Stones and Busta Rhymes. Google is offering 13 million tracks for sale, from three of the four major recording companies — Vivendi SA's Universal Music, EMI Group Ltd. and Sony Music Entertainment — and a host of independent labels. Warner Music Group was the major recording company left out. Warner spokespeople did not respond to requests for comment. Google is allowing sharing of purchased songs over its social network, Google Plus. Friends will be able to listen to one another's songs once for free. Once someone buys a song, it can be downloaded and is automatically uploaded for free into an online locker. The song can then be streamed over computer and mobile phone browsers, including the Safari browser, which comes on Apple Inc. devices such as the iPad. People who download the Google music app on devices running Android 2.2 and higher can stream stored songs or download them for offline playback within the app.