Relates also specifically to:
UK Singles Chart.
(See: "Electronic-age charts: the Gallup era")
Gallup, Inc. is an American analytics and advisory company based in Washington, D.C. Founded by George Gallup in 1935, the company became known for its public opinion polls conducted worldwide. Starting in the 1980s, Gallup transitioned its business to focus on providing analytics and management consulting to organizations globally. In addition to its analytics, management consulting, and Gallup Poll, the company also offers educational consulting, the CliftonStrengths assessment and associated products, and business and management books published by its Gallup Press unit.