Bach's first violin sonata is iconic and widely performed. The four movement sonata, although in G minor, has one flat in the key signature. This was typical in the Baroque era. Additionally, the fugue, which is the 2nd movements, was later adapted for Organ and Lute in Bach's Prelude and Fugue BWV 539 and Fugue BWV 1000. Emil Kross writes the following in his edition: In [Bach's] Adagio we find a great mass of embellishments (Runs, Turns) which must be executed with evenness and an easy grace. [Overloading with ornament] has now gone out of fashion. When studying the Adagio count very slow quavers at first and increase the tempo only after full mastery over the fingers and bow management has been obtained.