【正确答案】 Google's determined to take on Apple and Amazon. Amazon is also developing an online-music business of its own. Earlier this year, Google launched Music Beta, a service limited to the American market that lets consumers upload songs to a digital " locker" on its servers and then listen to them on any PC with a web connection or any mobile device using the search firm's Android operating system. This service , which lets people store up to 20,000 songs free in Google's computing " cloud" , will form part of the company's broader Google Music offering.