The problem: Mr. Ek had neither a plan, nor the time or money to do much about it. He knew whom to contact: Hjalmar Nilsonne, a Swedish tech entrepreneur who Mr. Ek had met the year prior at the Brilliant Minds event, an annual gathering Mr. Ek started. At first, Mr. Nilsonne rebuffed Mr. Ek’s proposition. But Mr. Ek eventually won him over. Mr. Ek, a former computer coder, and Mr. Nilsonne, an engineer, zeroed in on building a better diagnostic tool.

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Persons: Daniel Ek, ” Mr, Ek, DealBook, Hjalmar Nilsonne, Mr, Nilsonne, Watty Organizations: Spotify, Apple, YouTube, Amazon Music, Apple Watch, Neko Health Locations: Swedish, Stockholm, London