Also cable, on which messages can whizz back and forth, is far better-suited than satellite to the interactive age.

ECONOMIST: Tests for television

From web polling to Xbox streaming to Big Data analytics, interactive politics has come of age.

FORBES: Not Your Grandmother's Presidential Debate

Apps like Tonara are now bringing sheet music into the digital age, as well as leveraging new technologies (polyphonic score following) to provide a truly interactive experience to musical scores.

FORBES: Tonara: An Intelligent Music App