A recent study by NPD shows that streaming music inspires digital purchases. This finding goes against the common assumption that the rise of streaming music would negatively affect digital downloads.

How will this development affect the industry? As Fool contributor Daniel Sparks discusses with Fool.com's Erin Miller in the following video, it's just one more reason for Apple (AAPL 0.64%) to launch a streaming music service. And that, of course, would have serious ramifications for Pandora (P).