Did iTunes just give me a bunch of free music?

Okay so I've been avoiding updating iTunes ever since they introduced those gloomy monochromatic icons.
I just recently upgraded to the latest version since they brought the colors back (Yay!)

It looks great, but I noticed a bunch of albums I never ripped or purchased or downloaded in my library when I went into Album view. They have a Cloud Icon in the top right corner. What's up with that. Most of the new music is pretty hot, but I don't remember any of them and now here they are in my collection.