Hi Leonardo!
The most popular groups/singers in spain at the moment are those who were in the TV show
'Operación Triunfo'. Do you know this TV programme? Last year the show was won by 'Rosa', who went on to be Spain's representative for the Eurovision song Contest. This year, the winner was 'Beth'. Even though he didn't win, the most popular of these singers is David Bisbal. Have you heard anything by these artists?
Personally, it's not the kind of music I like best. I end up listening to a lot of flamenco at home because Isabel (my girlfriend) is a big fan (she also dances flamenco and plays percussion), although this type of music is not very popular in Barcelona.