Final answer:
The musician who set his guitar on fire at the Monterey Pop Festival in 1967 is Jimi Hendrix, reflecting the rebellious spirit of the 1960s.
Step-by-step explanation:
The iconic musician who famously doused his guitar with lighter fluid and set it on fire at the Monterey Pop Festival in 1967 was Jimi Hendrix, an impoverished half African American, half Native American left-handed guitarist from Seattle.
This moment has since become one of the most memorable in rock history, cutting through the era's cultural mainstream and allowing Hendrix to secure his place as one of the legendary figures in rock and roll.
The performance not only displayed Hendrix's showmanship but also reflected the countercultural sentiments of the 1960s, where music was an integral part of the social and political landscape, symbolizing rebellion and change.