These are the confirmed DDR Extreme songs, there are still a small handfull of songs missing.
Licensed Music
Diving (Radio Edit) - 4 Strings
Don't Clock Me - Popula Demand feat. The Get Fresh Girls
Go West - Pet Shop Boys
Highs Off U (Scorccio XY Mix) - 4 Reeel
Kick The Can - Bus*Stop
Kids In America - Kim Wilde
Miracle - St. Jannaro
Move Your Feet - Junior Senior
Music (Bostik Radio Edit) - Darude
Never Ending Story (Power Vocal Club Mix) - DJ-AC-DC
Only You - Captain Jack
Planet Rock (Swordfish Radio Edit) - Paul Oakenfold vs. Afrikaa Bambaataa and The Soul Sonic Force
Simply Being Loved "Somnabulist" - BT
The Reflex - Duran Duran
There You'll Be - DJ Speedo feat. Angelica
Wonderland (UKS Mix) - X-Treme
Y.M.C.A. - Village People
New Konami Original
321 Stars - DJ SIMON
A - DJ Amuro
A Stupid Barber - Sho-T
B4U (B4 Za Beat Mix) - NAOKI
Do Me (H.I.G.E.O Mix) - Moustache Men
Firefly - Be For U
Janejana - T.E.M.P.O. feat. Mohammed & Emi
Jet World - Mutsuhiko Izumi
Love Love Sugar - DJ Taka feat. Noria
Maximizer - Cli-Max S.
Mobo*Moga - Orange Lounge
Paranoia Eternal - STM 200
Pink Rose - Kiyommy + Seiya
Theme From Enter The Dragon (Notorious Mix) - B3-Project
The Legend Of Max - ZZ
Trip Machine Survivor - DE-SIRE
Tsugaru (Apple Mix) - RevenG Vs. DE-SIRE
V (for extreme) - TAKA
Wild Rush (From Nonstop Megamix) - Factor-X
You're Not Here - Heather
Your Rain (Rage Mix) - Akira Yamaoka feat. Mary Elizabeth McGlynn
Music From Karaoke Revolution
Believe - Eddie.J (Cover of Cher)
Bizarre Love Triangle - Jerry (Cover of New Order)
Ladies' Night - ? (Cover of Kool & The Gang)
Like A Virgin - tama_happytone (Cover of Madonna)
Waiting For Tonight - P.A.T. (Cover of Jennifer Lopez)
Returning Konami Originals
.59 - dj TAKA
Absolute - dj TAKA
B4U - NAOKI
Bad Routine - D.J. Spugna
Drop Out - NW260
Ecstacy - D-Complex
Higher - NM feat. Sunny
I Feel... - Akira Yamaoka
I'm For Real - Slake
Peace-Out - DJ Nagureo
So In Love - Caramel.S
Trip Machine - DE-SIRE
Tsugaru - RevenG vs. De-Sire
Wild Rush - Factor X