I'm looking for the original versions of 3 bulgarian pop/disco covers from the 70's & 80`s.

1-

https://www.youtube.com/watch?v=gY3wRZf_H_o
2-
https://www.youtube.com/watch?v=-R8aMTGPgSk
3-
https://www.youtube.com/watch?v=kaoW7h9C1Hc
Thanks in advance!