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(SOUNDBITE OF SONG, "MOVES LIKE JAGGER")

REBECCA SHEIR, HOST:

If there was one sound that dominated pop music this year, it's got to be this.

(SOUNDBITE OF SONG, "MOVES LIKE JAGGER")

SHEIR: You heard it in songs like...

(SOUNDBITE OF SONG, "PARTY ROCK ANTHEM")

LMFAO: (Singing) Shake that.

SHEIR: And...

(SOUNDBITE OF SONG, "FIREWORK")

KATY PERRY: (Singing) Baby, you're a firework...

SHEIR: And, yes...

(SOUNDBITE OF SONG, "SUPER BASS")

NICKI MINAJ: (Singing) Heartbeat running away...

SHEIR: It turns out that omnipresent sound actually has a name.

(SOUNDBITE OF SONG, "TILL THE WORLD ENDS")

SHEIR: Four-on-the-floor.

DJ EARWORM: Four-on-the-floor is when the bass drum goes boom, boom, boom, boom.

SHEIR: This is Jordan Roseman, aka DJ Earworm.

EARWORM: You feel it in your whole body just on every beat.

(SOUNDBITE OF SONG, "BORN THIS WAY")

LADY GAGA: (Singing) in my way 'cause God makes no mistakes...

EARWORM: Boom, boom, boom, boom.

(SOUNDBITE OF SONG, "BORN THIS WAY")

GAGA: (Singing) I'm on the right track baby I was born this way.

EARWORM: And it's so easy to understand, it's almost hard, you know, not to move to it.

SHEIR: Each year, Roseman concocts a mashup of the year's biggest pop hits. He calls it "The United State of Pop." And surprise, surprise, four-on-the-floor is pretty much a constant in this year's mix.

(SOUNDBITE OF MUSIC)

SHEIR: The idea here, says Roseman, is four-on-the-floor is so simple, so instantly danceable it's almost instinctive. So if you have no sense of rhythm, you can still get down with four-on-the-floor?

EARWORM: Yeah. I think so.

(SOUNDBITE OF LAUGHTER)

(SOUNDBITE OF MUSIC)

EARWORM: You can have a pretty poor sense. If you have no sense, then I don't know how to help you.

(SOUNDBITE OF LAUGHTER)

(SOUNDBITE OF MUSIC)

SHEIR: Now, where did four-on-the-floor originate? Is it a European thing?

EARWORM: If you want to say what the current trend, it goes back to disco right when these big speakers came along and all of a sudden the kick drums...

(SOUNDBITE OF MUSIC)

EARWORM: ...took this new prominence in music because you could really feel it.

(SOUNDBITE OF MUSIC)

EARWORM: It's definitely peaking right now for sure. It also has to do with, you know, us opening up to the whole world. Four-on-the-floor has this global sound. It's - while it's resurging in the States, it's been in Europe. And so I feel like it'll be here for a little while longer until the next wave comes.

SHEIR: Jordan Roseman, aka DJ Earworm. You can download his 2011 "United State of Pop" at djearworm.com. Mr. Earworm, Happy New Year.

EARWORM: Happy New Year to you too.

(SOUNDBITE OF MUSIC)

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