Amelia Rodrigues is the most well known Fado singer and this is the most well known song to come from that genre. I’m sure this song holds a lot of warm memories for folks who recognize it. For those who don’t, yes the guitar players do bear a strong resemblance to the Adams’s family.
For those who want to learn more about Fado….
In popular belief, fado is a form of music characterized by mournful tunes and lyrics, often about the sea or the life of the poor, and infused with a characteristic sentiment of resignation, fatefulness and melancholia (loosely captured by the word saudade, or “longing”). However, although the origins are difficult to trace, today fado is regarded, by many, as simply a form of song which can be about anything, but must follow a certain structure. The music is usually linked to the Portuguese word saudade which symbolizes the feeling of loss (a permanent, irreparable loss and its consequent lifelong damage). link
English translation of the song.