Musical scale The frequencies 440Hz and 880Hz both correspond to the musical note A, but one octave apart. The next higher A in the musical scale would have the frequency 1760Hz, twice 880Hz. In the western musical scale, there are 12 notes in every octave. Left is a table of the complete musical scale between middle A and A-880. The psychoacoustic properties of the musical scale are fascinating. Frequencies that are harmonically related tend to sound good together. The blue waveform is the sound you hear, which is a combination of the other (pure tone) waveforms. What about 440 × 3 = 1320? For somewhat more arcane reasons, the interval between A and E, which is a frequency rise of 3/2, is called a fifth. Where does the C sharp come from in the major triad? Among all the harmonic relationships in the scale, A, C sharp, and E have among the simplest. A major triad can be written as a sum of sinusoids s(t) = sin(440× 2π t) + sin(554 × 2π t) + sin(659× 2π t). The human ear hears frequencies.

Free Technology for Teachers Lord Alfred Tennyson Alfred Tennyson (1809-1892), English poet often regarded as the chief representative of the Victorian age in poetry. Tennyson succeeded Wordsworth as Poet Laureate in 1850. Alfred, Lord Tennyson was born on August 5, 1809 in Somersby, Lincolnshire. His next book, Poems (1833), received unfavorable reviews, and Tennyson ceased to publish for nearly ten years. After marrying Emily Sellwood, whom he had already met in 1836, the couple settled in Farringford, a house in Freshwater on the Isle of Wight in 1853. Among Tennyson's major poetic achievements is the elegy mourning the death of his friend Arthur Hallam, "In Memoriam" (1850). In the 1870s Tennyson wrote several plays, among them the poetic dramas Queen Mary (1875) and Harold (1876). Tennyson died at Aldwort on October 6, 1892 and was buried in the Poets' Corner in Westminster Abbey. The above biography is copyrighted.