Beta Quadra Music (rock n' roll)
Most United States rock n' roll produced during her most productive period (Late 60s to Early 90s) belongs to Beta Quadra. Sometime in the 90s sounds started to change. Socionics also classifies imitators overseas under United States rock n' roll because they're imitating United States forms.
IEI - Heavy Metal, Hair Metal, Progressive Metal.
SLE - Nickleback, AC/DC for certain.
LSI - Less common. Ted Nugent goes here, and so does Rammstein.
EIE - J-Rock goes here.
This all has to do with the style of music itself, ignoring lyrical content. There exists some correlation between quadra of the music itself and lyrical content (U.S. rock n' roll has a well-deserved stereotype of including sex and drugs, which are Beta quadra values), but analysis of song lyrics requires a different process
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