Encouraged by the success of some 1860s compositions, Lange produced a large number of works, most of which were light and popular piano pieces of which he wrote around 500. Edelweiss op. 31 and Blumenlied op. 39 (alternatively known as Flower Song in English) are perhaps two of his best-known works today.
A contemporary English source says: "Many of these pieces are very pleasing and pretty in character, but they are not marked by any very striking features".
^It is not exactly clear at which conservatory he studied. Lange's article in the German Wikipedia mentions a conservatory at Erfurt, but this was not founded before 1911. The nearest to Erfurt would have been at Leipzig. The French Wikipedia mentions the following names of teachers, and these were all involved as teachers at the Berlin institute.
^Brown, James Duff: Biographical Dictionary of Musicians (Paisley and London: Alexander Gardner, 1886; reprint Hildesheim: Georg Olms Verlag, 1970), p. 374.