Qadoos eliya

  The   guitar   is a   fretted   musical instrument   that typically has six   strings . It is held flat against the player's body and played by   strumming   or   plucking   the strings with the dominant hand, while simultaneously pressing selected strings against   frets   with the fingers of the opposite hand. A   plectrum   or individual finger   picks   may be used to strike the strings. The sound of the guitar is projected either acoustically, by means of a resonant chamber on the instrument, or amplified by an electronic   pickup   and an   amplifier . The guitar is classified as a  chordophone  – meaning the sound is produced by a vibrating string stretched between two fixed points. Historically, a guitar was constructed from wood with its strings made of  catgut . Steel guitar strings were introduced near the end of the nineteenth century in the United States; [1]...

  This article is about the musical instrument. For other uses, see   Piano (disambiguation) . "Pianoforte" redirects here. For earliest versions of the instrument only, see  Fortepiano . For the 1984 film, see  Pianoforte (film) . Piano A grand piano (left) and an upright piano (right) Keyboard instrument Hornbostel–Sachs classification 314.122-4-8 (Simple  chordophone  with  keyboard  sounded by hammers) Inventor(s) Bartolomeo Cristofori Developed Early 18th century Playing range Musicians Pianists  ( Lists of pianists ) The  piano  is an  acoustic ,  keyboard  and  stringed musical instrument  in which the strings are struck by wooden hammers that are coated with a softer material (modern hammers are covered with dense wool felt; some early pianos used leather). It is played using a  keyboard , which is a row of keys (small levers) that the performer presses down or strikes with the fingers and thumb...

  Music theory   is the study of the practices and possibilities of   music .   The Oxford Companion to Music   describes three interrelated uses of the term "music theory". The first is the " rudiments ", that are needed to understand music notation (key signatures, time signatures, and rhythmic notation); the second is learning scholars' views on music from antiquity to the present; the third is a sub-topic of   musicology   that "seeks to define processes and general principles in music". The musicological approach to theory differs from music analysis "in that it takes as its starting-point not the individual work or performance but the fundamental materials from which it is built." [1] Music theory is frequently concerned with describing how musicians and composers make music, including tuning systems and composition methods among other topics. Because of the ever-expanding conception of what constitutes music (see  Definition of music )...