Bemani/Awesome Music

Session Series (Drum Mania, Guitar Freaks & Keyboardmania)

The Least 100sec, and its long version The Least 333sec by Hirofumi Sasaki, from Guitar Freaks 5th Mix & Drum Mania 4th Mix. The latter in particular contains some beautiful piano playing, while still retaining the epic main part from the shorter version.
Funky sonic World by Des-ROW feat. SHIGE, from Guitar Freaks 10th Mix & Drummania 9th Mix.
brave! by TERRA from ee'MALL 2nd Avenue. ee'MALL was a short-lived internet-link system capable of unlocking content for Konami arcade games. brave! appeared in pop'n music and Guitar Freaks+Drummania.
Midori no Kaze by Naya~n, from Keyboardmania 3rd Mix.
Midnight Sun by Mutsuhiko Izumi (who's done composition for Sunset Riders and the Teenage Mutant Ninja Turtles arcade games), from Guitar Freaks 6th Mix / Drummania 5th Mix.
Pink Rose, originally from Keyboardmania, and has since appeared in pop'n music, DDR, and IIDX. The full version is an even bigger dose of the same kind of awesome.
The Day Dream series in its entirety, but especially Model DD7, from Guitar Freaks and Drum Mania V2.
SENSATION (from SALAMANDER2) is a neat arrangement of the Stage 2 music from (as the title implies) Salamander 2.
Hana-Tsuki-Kiseki from ee'MALL 2nd Avenue. Appeared in Guitar Freaks + Drummania & pop'n music.
Any song by Asaki.
Little prayer
Einherjar, which so far is the only Bemani song to have the merit of being composed in part by Nobuo Uematsu himself.

Other/Unsorted

Mobo*Moga by Orange Lounge, originated from the first mix of Dance Mania X and has appeared in countless other Bemani series since.
Gamelan de Couple by TOMOSUKE. Originally from Mambo a Go Go, this song has cropped up in many other Bemani series as well.
No Evans or Bass 2 Bass from Jubeat??
Fly Above and the Back Into The Light remix. Oh my GOD. Though I'll admit these might be a little bit Tastes Like Diabetes for some.
Tears For The Time. That is all.
Broken by dj TAKA, originating in Reflec Beat.