Question: Ludwig van Beethoven's Cello Sonata No. 3 in A major, Op. 69 was written in 1808, in the same year Beethoven also completed and published his Fifth and Sixth Symphonies, composed and completed in 1808, which was first performed in the Theater an der Wien on which date, in a four-hour concert?
Sentence (from "Cello Sonata No. 3 (Beethoven)"): Beethoven composed five sonatas for cello and piano over his lifetime; Steven Isserlis described his third sonata as the first cello sonata in history to give equally important parts to both of the instruments.
Relevant evidence: No