Fiesta

I've just seen "Fiesta" for the first time. I was especially intrigued by Montalban's piano playing, wondering if he was really playing. If he was, he was outstanding. But what really had me wondering was: in the scenes in the bullring, someone was really 'lidiando' (leading) the bull...who was it? I've seen many bullfights in Mexico around the time that this movie was filmed, and those were excellent 'faenas' (the actual movements with the cape while leading the bull) being executed, not fake. Whoever the real matador was, he deserved to be credited. Also, in one scene there was a group of singers who were dressed in clothing typical of 'estudiantinas' (university students whose specialty is singing in a particular Spanish style)...I wondered which group was performing and couldn't find them in the credits.