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...

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

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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