"It's good news that Apple is making streaming work but it is also going to accelerate the decline of downloads," said Mark Mulligan, music industry analyst with Midia Research. Apple was rapidly gaining on Spotify and at its current growth rate had "the potential to be the leading music subscription service sometime in 2017."
According to co-author Tim Bradshaw, Apple reached that number in 6 months, a number that took 6 years for rival Spotify.
Apple Music launched in June of 2015. While the service has no free or ad-supported tier, it does off a 3-month trial period for new subscribers.