Task: Question Answering
Input (English): Passage: After it became clear that Boult would have to leave the BBC, Thomas Russell, the managing director of the London Philharmonic Orchestra (LPO), offered him the post of principal conductor of the LPO in succession to Eduard van Beinum.  In the 1930s the LPO had flourished, but since Beecham's departure in 1940, it had struggled to survive. Boult was well known to the orchestra, having been among the musicians who came to its aid in 1940. He took over as chief conductor of the LPO in June 1950, immediately after leaving the BBC, and threw himself into the task of rebuilding it. In the early years of his conductorship, the finances of the LPO were perilous, and Boult subsidised the orchestra from his own funds for some time. The need to earn money obliged the orchestra to play many more concerts than its rivals. In the 1949–50 season, the LPO gave 248 concerts, compared with 55 by the BBC Symphony Orchestra, 103 by the London Symphony Orchestra, and 32 apiece by the Philharmonia and Royal Philharmonic orchestras.
Although he had worked extensively in the studio for the BBC, Boult had, up to this point, recorded only a part of his large repertoire for the gramophone.  With the LPO he began a series of commercial recordings that continued at a varying rate for the rest of his working life. Their first recordings together were Elgar's Falstaff, Mahler's Lieder eines fahrenden Gesellen with the mezzo Blanche Thebom, and Beethoven's First Symphony. The work of the new team was greeted with approval by the reviewers. Of the Elgar, The Gramophone wrote, "I have heard no other conductor approach [Boult's] performance. ... His newly adopted orchestra responds admirably". In The Manchester Guardian, Neville Cardus wrote, "Nobody is better able than Sir Adrian Boult to expound the subtly mingled contents of this master work."In January 1951 Boult and the LPO made a tour of Germany, described by Kennedy as "gruelling", with 12 concerts on 12 successive days. The symphonies they played were Beethoven's Seventh, Haydn's London, No 104, Brahms's First, Schumann's Fourth and Schubert's Great C major. The other works were Elgar's Introduction and Allegro, Holst's The Perfect Fool ballet music, Richard Strauss's Don Juan, and Stravinsky's Firebird. 
Question: What is the last name of the person who began a series of commercial recordings that continued at a varying rate for the rest of his working life?
Output (English): Boult.