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 "Symphony No. 5 (Beethoven)"): E. T. A. Hoffmann described the symphony as "one of the most important works of the time".
Relevant evidence: No