https://imslp.org/wiki/Jugend,_Op.139a_%28Karg-Elert,_Sigfrid%29
Jugend, Op.139a (Karg-Elert, Sigfrid) - IMSLP
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https://imslp.org/wiki/Chaconne_and_Fugue_Trilogy,_Op.73_(Karg-Elert,_Sigfrid)
Chaconne and Fugue Trilogy, Op.73 (Karg-Elert, Sigfrid) - IMSLP
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https://imslp.org/wiki/12_Impressions_for_Harmonium,_Op.102_(Karg-Elert,_Sigfrid)
12 Impressions for Harmonium, Op.102 (Karg-Elert, Sigfrid) - IMSLP
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https://www.encyclopedia.com/arts/dictionaries-thesauruses-pictures-and-press-releases/karg-elert-real-name-karg-sigfrid
Karg-Elert (real name, Karg), Sigfrid | Encyclopedia.com
Karg-Elert (real name, Karg), SigfridKarg-Elert (real name, Karg), Sigfrid, distinguished German organist, pedagogue, and composer; b. Oberndorf am Neckar,...
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