And another round...
Valtonen sisters, Finnish equivalent of Andrews Sisters, doing rhumba:
Harmony Sisters: Hymyillen / Vanhan kitaran laulu
Numerous people have recorded the first part of the song Meksikon pikajuna, but here is Repe Helismaa doing also the second part and resolving the situation.
Reino Helismaa: Meksikon pikajuna 1&2