This little record (2 sides of a 10" 78) made an inimaginable sucess at those days! And had everything to get this sucess. Francisco Alves was "the" singer here. The orchestra is arranged and conducted by Radames Gnatalli - one of the most proeminent classical conductors and composers at those days. And the songwriter, Ary Barroso, wrote some of the most famous songs of those days - specially ballads, more than numbers like the "Aquarela do Brasil".
The samba get a similar story that jazz took. its origins came from the "choro", a kind of ragtime, with strong influences from waltzes. And went to a big band fashion in early 30s/40s. And in 50s/60s, to bossa nova - let's say, a kind of intelectualized samba.
Curiously, here the spanish latin music didn't make great sucess until mid 50s. Some singers, like Gardel and Pedro vargas with tangos - but not the usual on radio. Guaranias and mambos were a lot exotic!