Put the following events in order from earliest to latest.
Earliest

Gregorian Chant established as the standard

Development of neumes

Pope Gregory founds Schola Cantorum

Schools for church music are established

Latest

Pope Gregory founds schola cantorum

Schools for church music are established

Gregorian chant established as the standard

Explanation:

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photography had emerged as an elite art pursued by a few creative individuals for a few wealthy patrons. but now, said bauldelaire, it was succumbing to "the great industrial madness of our times." it was becoming a mass production industry that catered to middle-class tastes, including a taste for gadgetry. the stereoscope, the first 3d imaging system, had turned looking at photographs into parlor entertainment. a "thousand hungry eyes were bending over the peepholes of the stereoscope as though they were the attic-windows of the infinite.