Those are the original songs from the Taiko no Tatsujin series.
“Lalala☆Happiness (ららら☆ハッピネス) is a song debut in 2009's Taiko no Tatsujin Wii: Do-Don to Nidaime...Lalala☆Happiness
“Nijiiro Yumeiro Taikoiro (虹色･夢色･太鼓色) is a song debut in 2002's Taiko no Tatsujin 3 arcade, and...Nijiiro Yumeiro Taikoiro
“Issho ni Asobo♪ (いっしょにあそぼ♪) is a song debuted in 2015's Taiko no Tatsujin: Atsumete★Tomodachi...Issho ni Asobo♪
“Kimi to Hibiku Harmony (キミと響くハーモニー) is a song debut in 2012's Taiko no Tatsujin: Little Dragon...Kimi to Hibiku Harmony
“Dororon Girl (どろろんガール) is the song debut in 2010's Taiko no Tatsujin DS: Dororon! Yokai Great...Dororon Girl
“Hibike! Taiko no Tatsujin (響け! 太鼓の達人) is a Namco Original song that was debuted in 2005's Taiko...Hibike! Taiko no Tatsujin
“Lovely-X (ラブリーX) is a song that was debuted in Taiko no Tatsujin 2. The song was performed...Lovely-X