just to correct gone_fishing's point about it not being legal for the Spanish ATC to speak spanish, they are quite entitled to actually.
Spanish AIP
3.2 Mobile service
The aeronautical stations maintain a continuous watch on
the allocated frequencies during the published hours of service,
unless otherwise notified. Aircraft must communicate
with the radio stations on the ground which exercise control
in the area or sector in which they are flying. Aircraft must
maintain continuous watch on the appropriate frequency of
the control station and shall not abandon watch, except in
case of emergency, without informing the control radio station.
The languages normally used in the air/ground communications
in all the control centres and TWR/APP services of the
international aerodromes are Spanish and English.
Note the order of 1) Spanish and 2) English....