Louis Spohr wrote four clarinet concertos as a result of his professional acquaintance with clarinetist Johann Simon Hermstedt. The first shows that Spohr’s often conservative approach to composition didn’t keep him from writing a concerto with some serious surprises. It’s a difficult work, especially for the clarinet of his time, which had fewer keys than the modern instrument.

The difficulty is partly due to Spohr’s unfamiliarity with what is easy and what is harder on a clarinet. His preface to the printed music reveals that this concerto led directly to improvements in the instrument’s design:
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