Here is my list of most wanted ROMs for MAME:
Dance 86.4 Funky Radio Station (Konami Python 2)
Dance Dance Revolution Supernova (Konami Python 2)
Dance Dance Revolution Supernova 2 (Konami Python 2)
DrumMania V (Konami Python 2)
DrumMania V2 (Konami Python 2)
DrumMania V3 (Konami Python 2)
Guitar Freaks V (Konami Python 2)
Guitar Freaks V2 (Konami Python 2)
Guitar Freaks V3 (Konami Python 2)
Nice Smash (Konami Python)
Perfect Pool (Konami Python)
Pop'n Music 10 (Konami Python)
Pop'n Music 11 (Konami Python)
Pop'n Music 12 Iroha (Konami Python)
Pop'n Music 13 Carnival (Konami Python)
Pop'n Music 14 Fever (Konami Python)
Speed King / Road Rage (Konami ZR107)
Thrill Drive 3 (Konami Python 2)
Toy's March (Konami Python 2)
Toy's March 2 (Konami Python 2)