Moon (Sadness Euro) from pop'n music 13 CARNIVAL is one of the very few reasons Beat'n Groovy doesn't completely suck.
Pop'n Music Ron (Megane Rock) by Gira Gira Megane Dan from pop'n music 13 CARNIVAL. So popular it spawned a sequel song Ryouran Hit Chart (Negame Rock) on GF/DM V3 & pop'n music 16 PARTY and a remix by MAKI (Megane Kayo) on pop'n music 18 Sengoku Retsuden.
High School Love (High Speed Love Song) also by DJ Yoshitaka featuring DWP, from pop'n music 14 FEVER. Also appeared in IIDX 14 GOLD.
From pop'n music 14 FEVER, we have the awesome techno/flamenco hybrid hora de verdad (Cyber Flamenco).
In the Ruins (Ancient Euro) from pop'n Music 15, a Eurobeat track with an ancient flavor to it.
pop'n music 15 ADVENTURE's Soul On Fire (Loud Mixture Ragga), by L.E.D. VS GUHROOVY fw NO+CHIN. Available as a download on a songpack for pop'n music on the Wii.
Tree in Lake (Contemporary Nation 4), from the game pop'n Music 17 THE MOVIE, yet another instant classic Nekomata track.
Ge-Ko-Ku-Jo (Gekokujo Drum'n'Bass) from pop'n music 18 Sengoku Retsuden.