This is DLC you can play in Taiko Mode.

*Song: "Dance Robot Dance"
Easy: ★3 Normal: ★4 Hard: ★4 Extreme: ★9

*Song: "A Tale of Six Trillion Years and a Night"
Easy: ★3 Normal: ★5 Hard: ★7 Extreme: ★9

*Song: "HAPPY SYNTHESIZER"
Easy: ★2 Normal: ★3 Hard: ★5 Extreme: ★7

*Song: "Woof Meow World"
Easy: ★4 Normal: ★5 Hard: ★6 Extreme: ★9

*Song: "MIRAI"
Easy: ★3 Normal: ★5 Hard: ★5 Extreme: ★8

*Character: Mirai Komachi

More details on the official game page of Taiko no Tatsujin: Drum 'n' Fun! VOCALOID™ Music Pack Vol. 2 ...