The present study makes available a modern performing edition of an eighteenth-centyry clarinet concerto. Written by the Mannheim oboist and composer Ludwig August Lebrun, the Concerto in B-flat for solo clarinet and orchestra has existed solely as a set of manuscript parts for over 200 years. The following chapters present biographical information on Ludwig August Lebrun as an oboist and composer of the late eighteenth century, the historical background of Lebrun's Concerto in B-flat. a thematic and harmonic analysis of the concerto's three movements, and a summary of the procedures followed in preparing the present edition of orchestral parts and piano reduction. Contemporaneous sources which provided pertinent performance practice information in the areas of articulation and ornamentation are also discussed. A copy of the piano reduction and orchestral performing parts are included in the appendices.