Utilize the input text as a context reference, choose the right relationship between launched and music streaming from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

Sept 29 Apple Inc launched Apple Music along with iTunes Movies and iBooks in China and said the cloud-based music streaming service will roll out on Android phones this fall.

Answer: distribution_format