Final answer:
The keyword that is not associated with Berlioz's Fantastical Symphony is Mathematics.
Step-by-step explanation:
The keyword that is not associated with Berlioz's Fantastical Symphony is Mathematics. The other keywords mentioned, such as Strauss's Thus Spake Zarathustra, Beethoven's Ninth Symphony, romantic music, French painter Eugene Delacroix, and Spanish artist Francisco Goya, all have connections to music and art, which are relevant to Berlioz's composition.