Name this tune

[Hgrove]

By chance I came across this website which plays a tune:

http://www.butterfly.adv.br/poemadamante.htm

I am familiar with the tune, I seem to have known it all my life, but what is it called?  Who composed it?  Was it in a film?  Thanks.

[RevShirls]

The tune is extremely well-known. It is called Romanza or Romance d'Amour. The composer is unknown but it is claimed to be a very old Spanish tune.

[am_i_wry?]

i rang shazam and it said it ad wes montgomery performing tequila, but that doesn't really sound right..