What are The Main Chord Progressions?

(music)

I – IV – V in every key: C major: C-F-G. D♭ major: D♭-G♭-A♭ ...

I – V – vi – IV in every key: C major: C-G-Am-F. D♭ major: D♭-A♭-B♭m-G♭ ...

ii – V – I in every key: C major: Dm-G-C. D♭ major: E♭m-A♭-D♭ ...

I – V – vi – iii – IV – I – IV – V in every key: C major: C-G-Am-Em-F-C-F-G.

Explanation:

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.