"Besame mucho" is one of the most beautiful Latin tunes, IMO; and I really like this version by Evora. The tune is not Brazilian at all (although Evora is from Cape Verde a Portuguese ex-colony); and, while the tune is often thought to be Cuban (since it was written as a Cuban rhumba) it was actually written by a Mexican composer. Here is the composer herself playing it:
https://m.youtube.com/watch?v=kIJZSs2gxdoMore often than not it is performed as a Cuban "bolero". This is a beautiful rendition in that lighter style:
https://m.youtube.com/watch?v=C-0geZkFHKEBTW, on the Baden Powell clip the flute that Rok asks about is simply an alto flute; a flute in the key of G, being larger and lower in pitch. The reason that it looks so different is that some models of the instrument are made with a curved head joint. The length of the tube is the same, but by curving it the player doesn't have to reach out as far to reach the keys; they are particularly popular with women who don't have as long a reach as men.