Utilize the input text as a context reference, choose the right relationship between Walkman and Sony 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.
Text: Around the same time that teams at Sony starting exploring ideas about a digital Walkman in 1999, Steve Jobs, the CEO of Apple, sat down with a team of engineers to try to create his own digital music experiment.
user
manufacturer
assistant