Which music streaming service was the first to launch a mobile subscription model allowing offline listening of streaming tracks, fundamentally changing how consumers accessed music?

The music industry has undergone numerous transformations in how people consume music - from vinyl records to cassettes, CDs to digital downloads. But one product launch in particular revolutionized the industry by introducing a subscription-based streaming model that would eventually become the dominant way people listen to music worldwide. Test your knowledge about this pivotal moment in music industry history!

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Spotify Premium (launched in October 2008)
Apple Music (launched in June 2015)
Pandora One (launched in September 2009)
Tidal (launched in October 2014)