A Brief History of Long Rock Songs - Is It Prog?

This episode of "Is It Prog" centers around the progression of the length of rock songs over the history of the genre, with a focus on the Progressive Rock musicians who kept pushing it further and further.
Obviously, in 15 minutes I couldn't do a completely comprehensive history, and there are a lot of landmark songs that I did not talk about, so feel free to discuss more about the topic in the comments!

Special Thanks to my Patrons on Patreon:

Darren Baker
Ben Guevara
Eric and Sheri Carbenia
Evan Satinsky  

  / isitprog  

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Citations and More:
Hippy Bus from "Going Furthur Documentary"
   • Going Furthur Documentary Official Tr...  
Phonograph Closeup microscopy (applied science)
   • Electron microscope slow-motion video...  
Mongolian Long Song:
   • Jargaltain delger long song with sing...  
https://en.wikipedia.org/wiki/Long_song
Waulking Songs:
https://en.wikipedia.org/wiki/Waulkin...
   • Women of The Outer Hebrides - Waulkin...  
Yankee Doodle:
https://www.nytimes.com/1989/07/04/op...
https://humorinamerica.wordpress.com/...

Rare Earth
Get Ready single video
   • Rare Earth - Get Ready - 45 RPM - Ori...  
History of Rare Earth
https://www.rareearth.com/?page_id=38
Tape Editing
   • Editing Analog Tape  
Thick as a brick cover video
   • Thick as a Brick by Jethro Tull: orig...  
Ian Anderson Reflects on "Overblown" Progressive Rock (Article)
https://somethingelsereviews.com/2014...
Passion Play Live
   • Jethro Tull LIVE 1975 A Passion Play,...  
Magog Pic
https://josiebowie.tumblr.com/post/42...
Pink floyd 70s footage
   • Pink Floyd - Animals Tour ( LIVE RARE...  
 
PCIII 
Onistwave: http://www.pipechoir.com/p-c-iii-musi...