There was still steam coming off of the headlines announcing that Apple Music's subscriptions have already soared to a third of the size of Spotify's premium users, but before the headlines could cool, app trackers have reported that Spotify has finally hit the top spot in the Apple App Store.

News of Spotify's latest landmark doesn't take anything away from the success of Apple Music. It evidences the growth of Spotify.

Spotify has earned the banking details of 20 million music lovers and has gotten about 55 million others to sit through ads to enjoy the streaming music service for free.

The months-old Apple Music service has amassed an impressive 15 million total users, about 6.5 million of which pay for the premium service. The figures on Apple Music's success were shared by Apple CEO Tim Cook on Monday.

"We have music experts, just like the DJ when we were growing up...that are deciding what's next," Cook said. "It brings the art back in music."

There still a lot of land to cover to catch up with Spotify. And Spotify doesn't appear to be slowing down.

Spotify had hovered around the number three spot in the Apple App store in the US since the start of the year. However, Spotify finally hit the top of US' charts for top grossing apps this month.

The two services are a lot alike, though there have been complaints about the complexity of Apple Music's interface and reports of bugs. Meanwhile, the more established Spotify enjoys an interface that has benefited from a stream of updates to its mobile and desktop apps.

One of Apple Music's big selling points is that it has playlists curated by musicians and experts, though Spotify uses a similar curation model.

"I'm finding personally that I'm discovering a whole lot of music that I wasn't listening to before," he said. "I think it's fabulous. And to have over 15 million on there, and 6.5 million in the paid category, I'm really happy about it, and I think the runway here is really good."

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