Pandora’s done forking its lunch over to Spotify. The popular internet radio service is going on-demand with a new “Premium” subscription service announced Monday.

Users will be able to pay $9.99 a month to search for and play whatever they want, whenever they want — and the service has a bit of Pandora’s secret sauce mixed in.

When you create a new playlist using the Premium service, you can ask Pandora to fill in any gaps using the same technology behind its radio service. 

The so-called “Music Genome Project” analyzes songs according to 450 attributes and uses this data — combined with what you tell Pandora you like or dislike — to play music tailored to your individual taste. Premium users can make a playlist, add two songs — “Blood and Thunder” and “Angel of Death,” say — tap “Add Similar” and get a bunch of other, uh, feel-good songs.

Pandora's new "Add Similar Songs" feature.

Pandora’s new “Add Similar Songs” feature.

Image: Pandora

Everything you've given a thumbs-up to in Pandora will be included in a new playlist.

Everything you’ve given a thumbs-up to in Pandora will be included in a new playlist.

Image: Pandora

Pandora promises that everything you’ve already given a “thumbs up” to on its internet radio service will carry over into a Premium playlist, and it’ll offer a “Browse” feature that offers personalized suggestions. The Premium services will launch for some users on a trial basis this Thursday and to everyone else in the…

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