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.

Now, Apple has launched its own music streaming service offering the same audio quality over the air.

Answer: distribution_format