Pandora adjusted its path and in the second business model they enacted the "free" revenue model which focused on an advertising revenue plan for the company. By focusing on operating the company on the revenue from other businesses willing to pay for advertisement space, Pandora was able to offer its service for "free" to its subscribers. Under the Free Model there were tiered payment options. After your initial 40 hours of music you had three options: 1. Choose to stop listening until the next month when you are reset to your allotted 40 hours. 2. Pay for a short term upgrade for $.99 to listen for the rest of the month. Become a member of a premium service that allowed for unlimited listening. These options made Pandora more appealing and marketable to potential clients. The second business model with the addition of the Buy Button (2006) created three different revenue avenues to Pandora (subscription, advertising and now affiliate fees revenue.).
Technically because Pandora offered the premium services or expanded services to clients willing to pay for their upgraded accessibility Pandora's revenue model is considered "freemium" ( Free and Premium combined) not just "free." The objective of Freemium is to give your service away for free, possibly ad supported but maybe not, acquire a lot of customers very efficiently through word of mouth, referral networks, organic search marketing, etc., then offer premium priced value added services or an enhanced version of your service to your customer base. The difference is "freemium" is when the company is based on giving away some services for free to 99% of customers and relying on the other 1% of customers to pay for premium versions of the same service verses in "free" models the company just gives away its services and rely on other revenue sources other that subscriptions fees to operate.