Read Between the Music Notes
This double-whammy easter egg is one that most MCU fans wouldn’t have gotten in a million years. It’s a double-pronged easter egg that starts with Obadiah Stane playing the piano. If you pay close attention, you’ll realize that he’s playing Antonio Salieri Piano Concerto in C major.
Salieri was Mozart’s musical rival who, as some sources claim, was involved in a conspiracy to kill the Austrian composer. The second of two whammies is how Obadiah informs Tony that the Arc Reactor is akin to his personal “ninth symphony,” subtly referencing the curse of the ninth symphony (spoiler alert: composers die after their ninth).