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The global electromagnetic resonance phenomenon is named after physicist Winfried Otto Schumann who predicted it mathematically in 1952. Schumann resonances are the principal background in the part of the electromagnetic spectrum [2] from 3 Hz through 60 Hz [3] and appear as distinct peaks at extremely low frequencies around 7.83 Hz (fundamental), 14.3, 20.8, 27.3, and 33.8 Hz.
Winfried Otto Schumann (May 20, 1888 – September 22, 1974) was a German physicist and electrical engineer who predicted the Schumann resonances, a series of low-frequency resonances caused by lightning discharges in the atmosphere.
Adagio and Allegro, Op. 70, is a chamber music piece in A-flat major for piano and horn (optionally cello, double bass, viola or violin) by Robert Schumann. It was written in February 1849. Schumann planned alternative editions before it was printed in which the horn or cello or violin could be replaced.
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Already on 10 January 1833, Schumann first expressed the idea of writing a Piano Concerto in A minor. In a letter to his future father-in-law, Friedrich Wieck, he wrote: "I think the piano concerto must be in C major or in A minor." [2] From 17–20 May 1841, Schumann wrote a fantasy for piano and orchestra, his Phantasie in A minor. [3]