Here is the listing of MIDI files you're able to listen to on our site, most of them are popular vocal synth songs.
1, 2, Fanclub
ACUTE
Adolesence
Butterfly On Your Right Shoulder
Circus Monster
Clover Club
Daughter Of Evil
Double Lariat
Electric Angel
Fire Flower
Hello, How Are You?
Hello Planet
Hibikase
Ievan Polkka
Just Be Friends
Kimi No Taion
Lost One's Weeping
Melancholic
Meltdown
Miku Miku Ni Shite Ageru
Palette
Remote Controller
Rotten Heresy And Chocolate
Senbonzakura
Servant Of Evil
World's End Dancehall