(Telecompaper) Google unveiled the Google Play Music All Access music subscription service at its I/O developer conference in San Francisco. The service will give access to streaming millions of songs, in addition to the company's existing music store and locker. The service will cost USD 9.99 a month, with a free trial for the first month. In other developments announced on the first day of the event, a special Galaxy S4 smartphone will be released from 26 June, featuring Google's latest software and services. The company also previewed a number of upcoming products, including new video codecs and payments APIs for Chrome, integration of Google Wallet and Gmail to support P2P payments, and new features in Google+, Search and Maps.