Beats Music, the streaming music subscription service that’s currently being courted by Apple for acquisition, apparently has 111,000 paying subscribers, according to a leaked royalty report acquired by VentureBeat.More specifically, Beats has 49,371 individual subscribers paying $10 a month, and 61,621 “family” accounts that cost $15 a month and allow up to five users. That’s a 55% group subscription rate on a B2C subscription service, which is impressive.Notably, Beats has far fewer subscribers than Spotify, which clocked in 6 million paying subscribers and 24 million registered users recently. However, Spotify was launched in 2008 while Beats just launched this year, showing impressive acquisition growth.At the same time, AT&T has been tying in a free three-month subscription with its mobile phone services. While marketing partnerships like this can be strong for growth, they can be problematic for retention, the Rolls Royce of subscription revenue metrics. So we’ll have to wait and see whether Beats will be able to compete with the other streaming music services in the industry.Apple’s courtship of Beats is well-founded, though. As I wrote on Monday, the era of digital downloads is dead, and rental, not ownership, is preferred by many content consumers. Apple’s previous reliance on 99-cent download revenue is likely waning and it’s smart to pick up a subscription music service while it can.