Gustav —, Austrian composer of song cycle Kindertotenlieder whose 1905 premiere was in Vienna (6)

I believe the answer is:

mahler

(Other definitions for mahler that I've seen before include "Gustav -, Austrian symphonist" , "Austrian composer from Harlem?" , "Harlem (anag) - composer" , "Gustav . . . . . ., Austrian composer" , "Gustave ......, noted Austrian composer-conductor" .)

I've seen this clue in The Mirror.

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