Which innovative pricing strategy helped Spotify rapidly expand its premium subscriber base in 2014-2015?

In the competitive world of music streaming, pricing strategies can make or break a platform's success. Different services have experimented with various approaches to monetization, from freemium models to family plans. This poll explores how one major streaming service revolutionized the industry with a strategic pricing decision that dramatically increased their market share and changed how consumers value music access.

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Family Plan allowing up to 6 users for $14.99/month (75% discount per user)
Pay-per-stream model where users only paid for songs they actually listened to
Tiered audio quality pricing (higher bitrate streams cost more)
Genre-based subscription packages allowing users to pay only for music categories they enjoy