I haven't got Spotify, but with a need for distraction today I'm going to do it myself using the algorithm of gut feeling and guesswork
I've also not got Spotify, or any of the other things you need to use that thing, but my phone's mp3 player does keep track of my most played. Which still isn't a perfect record - apart from anything else, I think my music taste for listening to music on my computer in my bedroom is a bit noisier than my music taste for walking around listening to headphones. Anyway, my headliners would be:
Beach House, Lana Del Rey, jeanines
I had no idea I listened to jeanines that much, but they are very good. Not sure how LDR is going to feel about turning up to hitmousefest and learning that the contract places strict stipulations on the amount of music from the last five years or so she's allowed to play. Other than than that, looks like The Hold Steady, Porridge Radio, The Mountain Goats, Waxahatchee, Xiu Xiu, elvis depressedly, Rudimentary Peni, Raveonettes (another suprise entry there), Cults, Lifter Puller, Rancid, Run the Jewels, Pins, Protomartyr, the Fall, and the World/Inferno Friendship Society would be the big names.