input: Lead Belly styled himself "King of the Twelve-String Guitar," and despite his use of other instruments like the accordion, the most enduring image of Lead Belly as a performer is wielding his unusually large Stella twelve-string. This guitar had a slightly longer scale length than a standard guitar, slotted tuners, ladder bracing, and a trapeze-style tailpiece to resist bridge lifting. Lead Belly played with finger picks much of the time, using a thumb pick to provide a walking bass line and occasionally to strum. This technique, combined with low tunings and heavy strings, gives many of his recordings a piano-like sound. Lead Belly's tuning is debated, but it seems to be a down-tuned variant of standard tuning; it is likely that he tuned his guitar strings relative to one another, so that the actual notes shifted as the strings wore. Lead Belly's playing style was popularized by Pete Seeger, who adopted the twelve-string guitar in the 1950s and released an instructional LP and book using Lead Belly as an exemplar of technique. In some of the recordings in which Lead Belly accompanied himself, he would make an unusual type of grunt between his verses, best described as "Haah!"; "Looky Looky Yonder," "Take This Hammer," "Linin' Track" and "Julie Ann Johnson" feature this unusual vocalization. In "Take This Hammer," Lead Belly explained, "Every time the men say, 'Haah,' the hammer falls. The hammer rings, and we swing, and we sing." The "haah" sound can be heard in work chants sung by Southern railroad section workers, "gandy dancers," in which it was used to coordinate work crews as they laid and maintained tracks.

Answer this question "How did Lead Belly come up with his technique?"
output: low tunings and heavy strings,

Problem: Background: Allen Welsh Dulles (; April 7, 1893 - January 29, 1969) was an American diplomat and lawyer who became the first civilian Director of Central Intelligence (DCI), and its longest-serving director to date. As head of the Central Intelligence Agency (CIA) during the early Cold War, he oversaw the 1954 Guatemalan coup d'etat, Operation Ajax (the overthrow of Iran's elected government), the Lockheed U-2 aircraft program and the Bay of Pigs Invasion. Following the assassination of John F. Kennedy, Dulles was one of the members of the Warren Commission. Between his stints of government service, Dulles was a corporate lawyer and partner at Sullivan & Cromwell.
Context: After the outbreak of the Second World War, Dulles was recruited to work at the Office of Strategic Services and moved to Bern, Switzerland, where he lived at Herrengasse 23 for the duration of World War II. As Swiss Director of the OSS, Dulles worked on intelligence regarding German plans and activities, and established wide contacts with German emigres, resistance figures, and anti-Nazi intelligence officers. He was assisted in intelligence-gathering activities by Gero von Schulze-Gaevernitz, a German emigrant. Dulles also received valuable information from Fritz Kolbe, a German diplomat, one whom he described as the best spy of the war. Kolbe supplied secret documents regarding active German spies and plans regarding the Messerschmitt Me 262 jet fighter. Although Washington barred Dulles from making firm commitments to the plotters of the 20 July 1944 attempt to assassinate Hitler, the conspirators nonetheless gave him reports on developments in Germany, including sketchy but accurate warnings of plans for Hitler's V-1 and V-2 missiles. Dulles was involved in Operation Sunrise, secret negotiations in March 1945 to arrange a local surrender of German forces in northern Italy. After the war in Europe, Dulles served for six months as the OSS Berlin station chief and later as station chief in Bern. The Office of Strategic Services was dissolved in October 1945 and its functions transferred to the State and War Departments. In the 1948 Presidential election, Dulles was, together with his brother, an advisor to Republican nominee Thomas E. Dewey. The Dulles brothers and James Forrestal helped form the Office of Policy Coordination. During 1949 he co-authored the Dulles-Jackson-Correa Report, which was sharply critical of the Central Intelligence Agency, which had been established by the National Security Act of 1947. Partly as a result of the report, Truman named a new Director of Central Intelligence, Lieutenant General Walter Bedell Smith.
Question: What kind of intelligence gathering activities?
Answer: secret documents regarding active German spies and plans regarding the Messerschmitt Me 262 jet fighter.

Question: Mirza Basheer-ud-Din Mahmood was born to Ghulam Ahmad and Nusrat Jahan Begum on 12 January 1889 in Qadian, the same year in which Ghulam Ahmad established the Ahmadiyya Movement by accepting allegiance from his disciples. Due to chronic illness Mahmood Ahmad was unable to attend to secondary education. During his youth, he remained an active member in the service of the Movement by founding a journal entitled Tash'heezul Az'haan and accompanied his father on many of his journeys. On 26 May 1908, Ghulam Ahmad died in Lahore when Mahmood Ahmad was 19 years old.

In 1931 the All India Kashmir Committee was set up for the establishment of the civil rights of the Muslims of Kashmir and to alleviate their oppression. Mahmood Ahmad was elected its first president. He sought to gather Muslim leaders with different opinions on one platform and strive unitedly for the cause of the Muslims of Kashmir. He is known to have achieved great success in doing so. The committee turned the attention of the Muslims of Kashmir towards acquiring education and Mahmood Ahmad himself gave practical help towards this cause. It also encouraged trade, commerce and involvement in politics among the Muslims of Kashmir. The committee however faced strong opposition from the Indian National Congress and the Ahrari campaign against the Ahmadiyya. The Ahrar alleged that the formation of the committee took place by the Ahmadiyya in order to spread its teachings and strongly opposed the leadership of Mahmood Ahmad. In an address to a gathering in 1931 Mahmood advised the Ahrar's thus: I admonish the Ahrari's that if there is any among them present here, they should go and tell their friends! I care not in the least about these stones and for this reason am not angered with them. They should stop this hearsay for the sake of the oppressed brothers of Kashmir. Let them come; I am ready to leave presidency but they must promise that they will follow the decision of the majority of Muslims. Today we have seen their morals, let them come and see our morals too. I assure them that even after stepping down from presidency, me and my community shall help them (the people of Kashmir) more than their associates. Presidency is not a thing of respect for me. Respect is gained from service. The leader of a nation is one who serves it ... Mahmood Ahmad resigned from presidency in 1932 due to the agitations of the Ahrar party.

Using a quote from the above article, answer the following question: Were they successful?
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Answer:
He is known to have achieved great success in doing so.