It's quite difficult to find good songs which are not in English or in the mother tongue. So I just want to write a few songs down:
Japanese:
England's Marshmellow Song or England's Demon Summoning Song
Nightmare by The World
iNSaNiTY by SF-A2 Miki feat. KAITO
Drrr! Opening 1 Song
French:
Les Rois du Monde (Kings of the World) by Roméo et Juliette
Toi Plus Moi (You plus me) by A lot of songs Grégoire
Là Où Je Vais (Where I go) by Judith
La Tribu De Dana (The tribe of Dana) by Manau
Russian:
Агония (Torture) by Макс Барских
Страшно (Scary) by Plastika
Лови Дыхание (Catch Breathe) by Do-Mи-No
Spanish:
Son Mis Amigos (They're my friends) by Amaral
Y A Ti Que Te Importa (And you who cares) by DESPISTAOS
Sube A Mi Cohete (Enter my Missle)
Ayer La Vi (Yesterday I saw her)
Greek:
OPA! (Let's go!) by Giorgos Alkaios & Friends
German:
Stadt (City) by Cassandra Steen (feat. Adel Tawil)
Hamlet by Wise Guys
Tanzende Schatten (Dancing Shadows) by Schwarzer Engel
Echt (Real) by Glasperlenspiel
Arabic:
انا وانتي تامر نفار كلمات
Korean/English mishmash:
Purple Line by DSBK
Ring Ding Dong by Shinee
Sorry Sorry by Super Junior
If you know any foreign language song, please tell me *.*