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1. Rock music originated from different styles: blues, saxophone solos, black and white gospel music, white country and western music, and from crooners and harmony groups.

2. Began in the 1950s as "rock n' roll" and then switched to "rock music" in 1964.

3. Gained huge popularity the '60s with Beatles, Elvis Presley, Chuck Barry, and the Rolling Stones. This brought the British Invasion of the music world.

4. In the 1980s, rock music was used for promotion and entertainment with music videos. Different groups used this, like Nirvana and Pearl Jam, to take political stances. The '90s was the time of resurgence where older bands were coming back into style.

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Coming from the UK in the '50s and '60s, Pink Floyd made a huge impact on rock music in the States. The band was originally comprised of Roger 'Syd' Barrett, Roger Waters, David Gilmour, Nick Mason, and Rick Wright. Then, it dwindled to the last four.

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In terms of the song itself, "Money" is a well put together piece of music, especially considering the fact that it is still being played all around to this day. From the lyrics, to the vocals, to the instruments. Furthermore, it utilizes sounds put in artificially, like coins falling and a cash register opening, for an iconic intro.
When I went to go see Roger Waters on his Us + Them tour, which just ended in the States, a big part of it was an anti-Trump segment. Regardless of my personal views, I thought it was very brave and daring. As someone from England, Roger Waters gets to view the U.S. as an outsider, and he now stands up for anyone under oppression, like immigrants and minorities. When "Money" came on, a song about the effects of money and its power of corruption, Waters showed images of Trump, photoshopped pictures with the president's head on a baby, and displayed different questionable quotes of his.
Because Massachusetts leans more towards the liberal side, he was applauded; however, there were a few Trump supporters in the crowd who were not happy with the act. Overall, Roger Waters used his platform and first amendment rights to speak out on something he believes in, using his songs in the process to really demonstrate his points.

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So, so you think you can tell Heaven from Hell, blue skies from pain.
Can you tell a green field from a cold steel rail?
A smile from a veil?
Do you think you can tell?

Did they get you to trade your heroes for ghosts?
Hot ashes for trees?
Hot air for a cool breeze?
Cold comfort for change?
Did you exchange a walk on part in the war for a lead role in a cage?

How I wish, how I wish you were here.
We're just two lost souls swimming in a fish bowl, year after year,
Running over the same old ground.
What have we found?
The same old fears.
Wish you were here.

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http://www.encyclopedia.com/literature-and-arts/performing-arts/music-popular-and-jazz/rock-music
http://www.pinkfloyd.com/history/biography.php
http://www.rollingstone.com/music/artists/pink-floyd/biography\