- The Communist Manifesto (Wikipedia)
The Communist Manifesto (German: Das Kommunistische Manifest), originally the Manifesto of the Communist Party (Manifest der Kommunistischen Partei), is a political pamphlet written by Karl Marx and Friedrich Engels, commissioned by the Communist League and originally published in London in 1848. The text is the first and most systematic attempt by Marx and Engels to codify for widespread consumption the core historical materialist idea that, as stated in the text’s opening words, “the history of all hitherto existing society is the history of class struggles”, in which social classes are defined by the relationship of people to the means of production. Published against the backdrop of the Revolutions of 1848 and their subsequent repression across Europe, the Manifesto remains one of the world’s most influential political documents.
- Piano (Wikipedia)
The piano is a keyboard instrument that produces sound when pressed on the keys. Most modern pianos have a row of 88 black and white keys: 52 white keys for the notes of the C major scale (C, D, E, F, G, A, and B) and 36 shorter black keys raised above the white keys and set further back, for sharps and flats. This means that the piano can play 88 different pitches (or “notes”), spanning a range of a bit over seven octaves. The black keys are for the “accidentals” (F♯/G♭, G♯/A♭, A♯/B♭, C♯/D♭, and D♯/E♭), which are needed to play in all twelve keys.