Extensive personal letter by the composer Julius Engelbert Röntgen. The letter is written on all four pages of a double-leaf to a "Lieber Herr Professor" to thank him for sending the "Telemann'schen Duetten", a publication with a for- and afterword by the addressee's son. The letter is most likely addressed to the eminent German musicologist Max Seiffert who played a prominent role in the Vereniging voor Nederlandsche Muziekgeschiedenis and the Dutch music scene of the interbellum. In very good condition.