does anyone know any info about these singers?

les montes,fun gang,sarah .....

les montes - dreams of rio
fun gang - just for fun
sarah - tokyo town, walkie talkie danzer

i heard these songs from mid-80's, but i can't find any infor of them.
i think all the songs from germany, (zyx,titan,emi)

who is sarah? is there any other songs from sarah? i only know upper 2 song. is the same person who sings "tokyo town" and "walkie talkie danzer"?

i have their maxi singles, but there are no information, please help me.
In sarah case, tokyo town and walkie talkie....cover's person is different

all songs are big hit in here.

have a nice day
best wishes