Power Rankings have been rating sports teams mid-season for years, based on statistical analysis, momentum and gut feelings. But there's just as much strategy and move-making involved in the big leagues of pop.

So, we bring you HuffPost's Pop Power Rankings, our weekly roundup of who's on top (and who has fallen off) in the pop game.

Previous Pop Power Rankings

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  • 1. Jay-Z (New Entry)

    Let's go down the list of Jay's year: had probably the biggest club song of the year with Kanye West, <a href="http://www.huffingtonpost.com/2012/12/05/grammys-nominations-2013-list_n_2228498.html?utm_hp_ref=canada-music&ir=Canada%20Music" target="_hplink">scored</a> six Grammy noms, sold out the new Brooklyn arena for eight nights this summer then turned those shows into a slick documentary available on his website, and the piece-de-resistance, NY artist Ellen Grossman's impromptu <a href="http://www.huffingtonpost.com/2012/12/06/ellen-grossman-jay-z-name-that-celebrity_n_2251117.html" target="_hplink">appearance</a> in the doc turns into a meme and turns her into a celebrity of her own. Jay-Z is not just a busy guy, but every move he makes makes waves.

  • 2. Beyonce (New Entry)

    Speaking of people who're making waves and are part of that same family, Jay's wife Bey has a documentary of her own coming out. Except this one she's not just executive producing. She's also directing and starring in it, and it's coming to HBO, pretty much the best TV-partner you could possibly get. It airs in February, right around the time that she'll appear on the Superbowl halftime show. No big deal.

  • 3. Taylor Swift (Re-Entry)

    Even though she was announcing the Grammy nominations this week and her album <em>Red</em> technically came out too late for consideration, Taylor still managed to grab three nominations for herself. First single "We Are Never Getting Back Together" is up for record of the year. Also, she's probably going to have some new song material soon because she's dating One Direction's Harry Styles, a match that seems ripe for lyrical material. Will Harry's song to appear on a <em>Red: Special Edition</em> next year?

  • 4. Rihanna (Last Rank: 1)

    Ri Ri is still chugging away with her album staying top ten, "Diamonds" still at #1, and readying her huge international tour. But that's not enough for her team. You may have heard about mixed reviews for her appearance on U.K. designer-competition reality TV series <em>Styled To Rock</em>, but that isn't stopping them from relaunching it in the U.S. next year. Style Network will air the American version in the latter half of 2013, and the show is being executive produced by Rihanna herself.

  • 5. Drake (New Entry)

    Drake's done well this week, adding three more Grammy nominations to his previous nine. But the quiet story of the week is the launching of his own O.V.O. record label with Warner Bros. After providing mentorship and co-signs to talented young artists like The Weeknd, Drake is looking to turn his little pool of talent into an empire, following in the footsteps of rappers-turned-CEOs like Jay-Z and Rick Ross. Based on his good judgement so far, it's looking good.

  • Pop Power Fail - Justin Bieber

    Try as Bieb-ager Scooter Braun might, he can't always keep the Biebs at the top of the power list. With this week's Grammy Noms out, and no sign of JB on there, Scooter took to twitter to <a href="http://www.huffingtonpost.com/2012/12/05/justin-bieber-grammys-snub_n_2241892.html?utm_hp_ref=canada-music&ir=Canada%20Music" target="_hplink">slam</a> the Grammys for overlooking him. Braun said, among other things, "I just plain DISAGREE." If the Grammys were based on "sold out tours," "huge successful albums" and "hard work" like Braun is touting, then maybe Justin would have a chance. Unfortunately for Scooter, according to the Grammys, it's based on the actual "music."