Final answer:
The source of the allusion in the sentence provided is history, specifically referring to the legendary quest for the Holy Grail.
Explanation:
The source of the allusion in the sentence provided is history.
In the sentence, the description of Bob Dylan's handwritten lyrics as 'the holy grail of lyrics' alludes to the legendary and mystical quest for the Holy Grail in history.
This allusion adds depth and significance to the value and importance attributed to Dylan's handwritten lyrics, likening them to a sacred and highly sought-after treasure.
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