A tuna is a group of university students in traditional university outfits
(The ones that inspired J.K.Rowling for the Hogwarts students clothes) who
play traditional instruments and sing traditional music.
The tradition originated in Spain and Portugal in the 13th century as a
means of students to earn money or food. Nowadays students don't belong to
a "tuna" for money, nor food, but seeking to keep a tradition alive, for
fun, to travel a lot and to meet new people from other universities.
