Patapon is actually one of my favorite PSP games, the main gameplay is done by drumming commands to yor troops in battle formation. You have four drums, each mapped to your face buttons, "Pon" "Pata" "Chacka" "Don". Pata pata pata pon is the march command, while pon pon pata pon issues attack, for example. As the screen flashes, you time your drum beats in sync to give the commands. Your troops follow the command for the period of four beats, and the next four are used to issue the next order. Poor timing or breaking the command/obey pattern will knock you out of your streak.
Of the masks I have collected, and to my knowledge I have every one, the Rabanassara is my favorite. It just about tripples how many times your hero unit can attack on a pon pon pata pon command.