libretto

LI-Lee, BRETTO-Bret: we know that Bret Lee is member of a band also, so imagine Li Bretto singing in an opera house...

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library(lib) se opera ki text ki book le ke rato(mugging up)(retto)

here retto in the word sounds like retro music which instantly reminds u of music so remeber opera

for writing the text of an opera you have to RATTO(cram) the whole LIB(rary)

As in we have to ratto (to cram) the Library books....

lib + ratto : if your teacher asks you to write an essay on opera then you'll go to lib and rattafy the libretto