Spotify says its subscribers now number 15 million

New York

SPOTIFY, the streaming music service, has signed up 15 million subscribers, a sign of rapid growth for the company and an implicit rebuttal in a roiling industry debate over whether people are willing to pay for music online.

Spotify, which is available in both free and paid tiers, announced its latest milestone in a brief blog post on Monday, just eight months after it said it had reached 10 million.