On the base of Montjuic, this is a musical fountain which moves to the tune of music (obviously) - most of which is english actually and not spanish.
It operates only on the weekends - Friday to Sunday.
If you are in Barcelona, this is a definite place to go. I shot a video too. Will upload once its up on YouTube.
BTW, this black and white effect is a complete fluke. My BB camera got royally confused because the fountain had varied lighting and changing colors so I suppose it gave up trying to figure it out and spat out b/w instead. But I really like it this way. Don't you?