In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.

Passage: From the days of 78 rpm discs, when relatively little modern music was being put on record, Walton was favoured by the record companies. In 1929 the small, new Decca company recorded eleven movements from Façade, with the composer conducting a chamber ensemble, with the speakers Edith Sitwell and Walton's friend and colleague Constant Lambert.       In the 1930s, Walton also had two of his major orchestral works on disc, both on Decca, the First Symphony recorded by Harty and the London Symphony Orchestra, and the Viola Concerto with Frederick Riddle and the LSO conducted by the composer. In the 1940s Walton moved from Decca to its older, larger rival, EMI. The EMI producer Walter Legge arranged a series of recordings of Walton's major works and many minor ones over the next twenty years; a rival composer expressed the view that if Walton had an attack of flatulence (he used an earthier expression), Walter Legge would record it.Walton himself, although a reluctant conductor, conducted many of the EMI recordings, and some for other labels. He made studio recordings of the First Symphony, the Viola Concerto, the Violin Concerto, the Sinfonia Concertante, the Façade Suites, the Partita, Belshazzar's Feast, and suites from his film scores for Shakespeare plays and The First of the Few. Some live performances conducted by Walton were recorded and have been released on compact disc, including the Cello Concerto and the Coronation Te Deum.Almost all Walton's works have been recorded for commercial release. EMI published a "Walton Edition" of his major works on CD in the 1990s, and the recording of the Chandos Records "Walton Edition" of his works was completed in 2010. His best-known works have been recorded by performers from many countries. Among the frequently recorded are Belshazzar's Feast, the Viola and Violin Concertos and the First Symphony, which has had more than twenty recordings since Harty's 1936 set.
What is the name of the person conducting a chamber ensemble, with the speaker Edith Sitwell?