Radio

Radio is the use of radio waves is to carry information, such as sound, by systematically modulating some property of electromagnetic energy waves transmitted through space, such as their amplitude, frequency, phase, or pulse width. When radio waves strike an electrical conductor, the oscillating fields induce an alternating current in the conductor. The information in the waves can be extracted and transformed back into its original form.

Radio systems need a transmitter to modulate (change) some property of the energy produced to impress a signal on it, for example using amplitude modulation or angle modulation (which can be frequency modulation or phase modulation). Radio systems also need an antenna to convert electric currents into radio waves, and vice versa. An antenna can be used for both transmitting and receiving. The electrical resonance of tuned circuits in radios allow individual stations to be selected. The electromagnetic wave is intercepted by a tuned receiving antenna. A radio receiver receives its input from an antenna and converts it into a form usable for the consumer, such as sound, pictures, digital data, measurement values, navigational positions, etc. Radio frequencies occupy the range from a 3 kHz to 300 GHz, although commercially important uses of radio use only a small part of this spectrum.

Surname

A surname or family name is a name added to a given name. In many cases, a surname is a family name and many dictionaries define "surname" as a synonym of "family name". In the western hemisphere, it is commonly synonymous with last name because it is usually placed at the end of a person's given name.

In most Spanish-speaking and Portuguese-speaking countries, two or more last names (or surnames) may be used. In China, Hungary, Japan, Korea, Madagascar, Taiwan, Vietnam, and parts of India, the family name is placed before a person's given name.

The style of having both a family name (surname) and a given name (forename) is far from universal. In many countries, it is common for ordinary people to have only one name or mononym.

The concept of a "surname" is a relatively recent historical development, evolving from a medieval naming practice called a "byname". Based on an individual's occupation or area of residence, a byname would be used in situations where more than one person had the same name.

Béla Bartók

Béla Viktor János Bartók (/ˈbɑːrtɒk/; Hungarian pronunciation: [ˈbeːlɒ ˈbɒrtoːk]; 25 March 1881 – 26 September 1945) was a Hungarian composer and pianist. He is considered one of the most important composers of the 20th century; he and Liszt are regarded as Hungary's greatest composers (Gillies 2001). Through his collection and analytical study of folk music, he was one of the founders of comparative musicology, which later became ethnomusicology. On 1 January 2016 his work entered the public domain in the European Union.

Biography

Childhood and early years (1881–98)

Béla Bartók was born in the small Banatian town of Nagyszentmiklós in the Kingdom of Hungary, Austria-Hungary (since 1920 Sânnicolau Mare, Romania) on 25 March 1881. Bartók had a diverse ancestry. On his father's side, the Bartók family was a Hungarian lower noble family, originating from Borsodszirák, Borsod county (Móser 2006a, 44). Although, his father's mother was of a Roman Catholic Serbian family (Bayley 2001, 16). Béla Bartók's mother, Paula (born Paula Voit), was an ethnic German, though she spoke Hungarian fluently (Bayley 2001, 16).

Piano concerto

A piano concerto is a concerto written for a piano accompanied by an orchestra or other large ensemble.

Keyboard concerti were common in the time of Johann Sebastian Bach. Occasionally, Bach's harpsichord concerti are played on piano.

History

In the 17th and 18th centuries, typical concertos for keyboard were organ concertos and harpsichord concertos, such as those written by George Friedrich Handel and Johann Sebastian Bach.

Classical and romantic

As the piano developed and became accepted, composers naturally started writing concerti for it. This happened in the late 18th century, during the Classical music era. Wolfgang Amadeus Mozart was the most important composer in the early development of the form. Mozart's body of masterly piano concerti put his stamp firmly on the genre well into the Romantic era.

Mozart wrote many piano concertos for himself to perform (his 27 piano concertos also include concerti for two and three pianos). With the rise of the piano virtuoso, many composer-pianists did likewise, notably Ludwig van Beethoven, Frédéric Chopin, and Robert Schumann—and also lesser-known musicians like Johann Nepomuk Hummel, Joseph Wölfl, Carl Maria von Weber, John Field, Ferdinand Ries, and F. X. Mozart.

Orchestra

An orchestra (/ˈɔːrkᵻstrə/ or US /ˈɔːrˌkɛstrə/; Italian: [orˈkɛstra]) is a large instrumental ensemble used in classical music that contains sections of string (violin, viola, cello and double bass), brass, woodwind, and percussion instruments. Other instruments such as the piano and celesta may sometimes be grouped into a fifth section such as a keyboard section or may stand alone, as may the concert harp and, for 20th and 21st century compositions, electric and electronic instruments. The term orchestra derives from the Greek ὀρχήστρα, the name for the area in front of an ancient Greek stage reserved for the Greek chorus. The orchestra grew by accretion throughout the 18th and 19th centuries, but changed very little in composition during the course of the 20th century.