Put the following composers in order form earliest to latest.
guillaume de machaut
léonin
john of forneste
pérotin

Léonin

Pérotin

John of Forneste

Guillaume de Machaut

Explanation: Guillaume de Machaut lived in the 1300

Léonin lived in the mid 1100 until the start of the 1200

John of Forneste lived in the mid 1100, and died in the 1239

Pérotin was born aroun 1160, and died in 1230

Bassed on this, the list from earliest to latest would be:

Léonin, Pérotin, John of Forneste, Guillaume de Machaut

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.