Spotify reportedly has 175,000 paying U.S. customers less than a month after its launch. (David Paul Morris/BLOOMBERG)

That’s particularly impressive given that the service is currently in an invite-only launch.

These early numbers aren’t enough to paint a good picture of whether the service will succeed in the United States.

Kafka points out that the company has seen a better free-to-paid conversion rate in Europe, but mentions that the service is also running a six-month welcome trial that offers U.S. users more free access to music.

If the service does succeed, it has the potential to change a lot. Spotify was created in part to combat music piracy, and Daniel Ek told Fortune last month that he hopes the service changes more than that. He thinks the Spotify model could change the way people listen to music.

“This model works very differently,” Ek said in a July interview with Fortune. “If you think about the history of music, it's really been around how you need to buy this record, you need to buy this album or you need to buy this song. And what Spotify is saying is ownership is great but access is the future.”

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