Wolfgang Amadeus Mozart's Requiem and Franz Schubert's Symphony no. 8 in B Minor have which of the following in common?

This statement is incorrect as neither work had its first performance at the Estates Theater. Mozart's Requiem was first performed in 1793, at the request of Anna von Klempner, while Schubert's Symphony No. 8 was not performed until 1865, long after Schubert's death, and neither involved this specific venue.

While Brahms' funeral did include performances of various works, it did not specifically feature either Mozart's Requiem or Schubert's Symphony No. 8 as a standard practice. This option misrepresents the historical context and selection of music typically performed during Brahms' memorial service.

This assertion is incorrect as neither work is dedicated to Francis II. Mozart's Requiem was commissioned anonymously, and Schubert's Symphony No. 8 does not have any known dedication to the emperor, making this statement factually inaccurate.

While Mozart's Requiem does indeed feature a quartet of vocal soloists (soprano, alto, tenor, and bass), Schubert's Symphony No. 8 does not include vocalists at all, as it is an orchestral work. Therefore, this option incorrectly suggests a commonality that does not exist.