Joni Mitchell is a Canadian Folk songwriter, multi- instrumentalist and painter who was famous during the 70s onwards. Mitchell liked to sing about her personal life as well as problems that were occurring in society.

One of her most popular songs 'Big Yellow Taxi' was released in 1970 and targeted environmental destruction. She wrote this song on a trip to Hawaii where she noticed a large parking lot that tarnished the natural beauty. Throughout the chorus, Mitchell repeats the phrase “They paved paradise and put up a parking lot.” This line references the stain of asphalt and concrete on nature. 

https://www.science.smith.edu/climatelit/big-yellow-taxi-by-joni-mitchell/#:~:text=%E2%80%9CBig%20Yellow%20Taxi%E2%80%9D%20is%20an,of%20the%20northern%20Pacific%20Ocean.

 The guitar was a central instrument in the 1970s for rock n roll and those who played it superbly were idolized. Such as Brian May, Jimmy Page, and Eric Clapton. Whilst the electric guitar has been used in popular music since the 1930s, it was arguably the players of the 1970s that really showed the world how far we can go with this instrument. 

A popular chord progression that was considered the foundation of classic rock ‘n’ roll, modern rock, and pop music. It is extremely common in songs from the 1960s to 1970s and traces its roots all the way back to the blues, as guitarists still incorporated the 12-bar-blues chord progression. 

 C - F - G  (I - IV - V)

Playing these three chords in different variations will also give you some other common progressions. An example that uses the simple I - IV - V progression is the entirety of “Stir it Up” by Bob Marley.

  https://www.libertyparkmusic.com/5-common-guitar-chord-progressions/#:~:text=C%20%2D%20F%20%2D%20G%20(I%20%2D%20IV%20%2D%20V)&text=It%20is%20extremely%20common%20in,you%20some%20other%20common%20progressions.

The introduction of synthesizers and other electronic instruments opened up new possibilities for musicians, allowing them to experiment with sounds that had never been heard before. It was during this time that artists like Kraftwerk, Giorgio Moroder, and David Bowie began incorporating synthesizers into their music, laying the foundation for the synth-pop movement.

Synthesizers are used for the composition of electronic music and in live performances. The intricate apparatus of the sound synthesizer generates waveforms and then subjects them to alteration in intensity, duration, frequency, and timbre, as selected by the composer or musician.

Further on, synthesizers grew in popularity within the 1980s, as new romantics and glam rock artists took to creating new sounds that were not heard of before. Changing their aesthetic and groove and paving the way for mainstream music in the 1980s.

 https://www.yellowbrick.co/blog/music/discover-the-electrifying-sounds-synth-pop-in-the-70s#:~:text=The%201970s%20marked%20a%20period,had%20never%20been%20heard%20before.

In my group, for our 1970s song we covered Eagles classic hit 'Hotel California' released in 1976. The song is about the experimentation of drugs in Mexico that the band experienced. The song has been described as being "all about American decadence and burnout, too much money, corruption, drugs, and arrogance; too little humility and heart." It has also been interpreted as an allegory about hedonism, self-destruction, and greed in the music industry of the late 1970s. 

1. The working title of “Hotel California” was “Mexican Reggae.”

Though it’s since become synonymous with the dark, sinister underside of Los Angeles, the album’s title track took shape in a surprisingly idyllic setting. Don Felder had rented a beach house in Malibu, and was in the midst of taking in the ocean breeze as he leisurely strummed his guitar. “I remember sitting in the living room on a spectacular July day with the doors wide open,” he told Guitar World in 2013. “I had a bathing suit on and was sitting on this couch, soaking wet, thinking the world is a wonderful place to be. I had this acoustic 12-string and started tinkling around with it, and those ‘Hotel California’ chords just kind of oozed out.” 

These artists were some of the biggest names in the 1970s, with their ground-breaking  music that influenced future musicians. Harmonically, Marvin Gaye takes on the funk and soul with his hit 'Whats Going On' album and hit song. What's Going On is written in the key of E Major. According to the Theory tab database, it is the 5th most popular key among Major keys and the 5th most popular among all keys. Major keys, along with minor keys, are a common choice for popular songs. The three most important chords, built off the 1st, 4th and 5th scale degrees are all major chords (E Major, A Major, and B Major). Harmonically within Pink Floyds hit 'Another Brick in The Wall' .  

Another Brick In The Wall is written in the key of D Dorian. According to the Theorytab database, it is the most popular key among Dorian keys and the 27th most popular among all keys. The D Dorian scale is similar to the D Minor scale except that its 6th note is a half step higher (B). Chord progressions in Dorian have a characteristic sound due to the major quality of the chord built on the 4th scale degree. 

Both groups of musicians share in common with changing the music industry revolutionizing classic genres and turning them modernistic. Pink Floyd was the architect of two major music movements psychedelic space-rock and blues-based progressive rock and became known for their biting political, social, and emotional commentary. Marvin Gaye e

The way he pushed his music to capture political ideas and actively protest in the way he knew best — through his incredible musicianship. Gaye reinvented what social boundaries could be like for a singer and truly introduced the vastness of what great music could be. Therefore both groups pushed the industry in order to make way for up-and-coming artists.