Final Fantasy IV: The After Years/Band System

A Band is a type of ability introduced in The After Years that allows multiple characters to "band" together for one attack. All involved characters consume MP to use a Band. This system is similar to the double and triple techs of Chrono Trigger in that, specific party members and attacks are required to successfully execute a Band. Bands can be learned through the course of the game's story or they can be "discovered" in battle by matching the right characters and attacks together.

To discover a Band in battle, press at the command list of the character who will initiate the attack and then select Band with. Next, choose the characters you want to join with and what attack type they will use (Attack, White Magic, etc.). When you're ready to see if the combination will work, press. If you've already unlocked a Band Ability, choose the Band option like before and then simply select the Band you want to perform from the list.