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Technicals rather rusty these days - life got too busy - but rings about right.

"The Jack" by AC/DC is a blues-rock song that employs a variation of the 12-bar blues progression. While it might not follow the traditional 12-bar blues structure exactly, it certainly draws heavily from the blues style and incorporates elements commonly found in 12-bar blues progressions.
Traditional 12-Bar Blues Progression
A traditional 12-bar blues progression follows this pattern:
  1. I - I - I - I
  2. IV - IV - I - I
  3. V - IV - I - I
In the key of A, this would look like:
  1. A - A - A - A
  2. D - D - A - A
  3. E - D - A - A
"The Jack" Progression
"The Jack" by AC/DC is in the key of A and uses a bluesy progression that can be broken down as follows:
  1. A - A - D - A
  2. A - A - D - A
  3. E - D - A - A
As you can see, while it does not follow the traditional 12-bar blues to the letter, it retains a similar feel and structure. The variations include extended measures on certain chords and a slightly different order, but the blues influence is unmistakable.
Musical Elements
  1. Chord Structure: The song uses the I (A), IV (D), and V (E) chords typical of blues.
  2. Lyrics and Melody: The lyrics and vocal delivery are in a call-and-response style, another hallmark of blues music.
  3. Instrumentation: The guitar riffs and solos in "The Jack" are heavily blues-influenced, with a focus on pentatonic scales and bluesy bends.
Overall, "The Jack" by AC/DC is a great example of how rock bands incorporate and adapt the 12-bar blues progression into their own unique sound.

source: ChatGPT

Ifs fairly obvious what the lyrics are about - however, specifically ....

The Jack

This song is about a venereal disease - "The Jack" is Australian slang for Gonorrhea, which is also known as "The Clap." AC/DC lead singer Bon Scott explained the origin of the song in a 1976 interview with Sounds. Said Scott: "We were living with this houseful of ladies who were all very friendly and everyone in the band had got the jack. So we wrote this song and the first time we did it on stage they were all in the front row with no idea what was goin' to happen. When it came to repeatin' 'She's got the jack' I pointed at them one after another." Added guitarist Angus Young: "After that, wherever we did the song the girls in the audience would run to the back of the hall.

Bon Scott was known for his outrageous ....

source: https://www.songfacts.com/facts/ac-dc/the-jack
 
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