http://www.siliconera.com/2012/02/06/level-up-together-with-theatrhythm-final-fantasys-cooperative-multiplayer-mode/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+siliconera%2FMkOc+%28Siliconera%29

From article:

"You can invite a friend, up to three actually, to Theatrhythm: Final Fantasy’s Chaos Temple. In this mode up to four players can earn experience points and find rare items as a group while the Song of Darkness plays.

As a team, you can fight Final Fantasy superbosses like Omega, Shinryu, and Ultima Weapon (pictured).

Theatrhythm: Final Fantasy comes out on February 16."

This is great news for the Japanese audience, as local multiplayer is popular over there. It got a 36/40 from famitsu so more good news the better. But I wish the whole game had it and not just some boss battle mode though.

This info came from a new scan
http://nintendoeverything.com/82260/theatrhythm-final-fantasy-scan-2/

Awesome! Elite Beat Agents multiplayer was great, but a co-op mode sounds even better. Is this only for multi-card play, or can you do it with a single card?

I dunno but if someone can translate that scan, maybe.

Nice, i really hope this arrives in Europe.

For battle themes: I heard One Winged Angel, Dancing Mad (part IV), 4 Elemental fiends battle theme, FFIII boss theme, Man with the Machine gun, Clash on the Big Bridge, FFVI decisive battle amongst others.  

If the game has the following then it is a must buy:

What am i looking at? That looks disgracefull.

Someone playing Theatrhythm final fantasy

The woman seems to be an ff fan

I find it funny, I was watching the video enjoying it, until Final Fantasy 13 music showed up and I was suddenly disappointed. It really feels unfitting in final fantasy collection.

My cousin is obssesed with this boss theme LOLOL