ensembles..." As a musical form Composition techniques draw parallels from visual art's formal elements. Sometimes, the entire form of a piece is through-composed, meaning that each part is different, with no repetition of sections; other forms include strophic, rondo, verse-chorus, and others. Some pieces are composed around a set scale, where the compositional technique might be considered the usage of a particular scale. Others are composed during performance (see improvisation), where a variety of techniques are also sometimes used. Some are used from particular songs which are familiar. The scale for the notes used, including the mode and tonic note, is important in tonal musical composition. Similarly, music of the Middle East employs compositions that are rigidly based on a specific mode (maqam) often within improvisational contexts, as does Indian classical music in both the Hindustani and the Carnatic system. Indian tradition In the music tradition of India there are many forms of musical composition. To some degree this is on account of there being many musical styles prevalent in different regions of the country, such as Hindustani music, Carnatic music, Bengali music, and so forth. Another important influence in composition is its link with folk music, both indigenous and also from musical culture of Arabia, Persia, and Bengal. In the Hindustani musical tradition, Drupad (originally in Sanskrit and later adaptations in Hindi and Braj Bhasha) is one of the ancient compositions and had formed the base for other forms in this music tradition such as khyal, thumri and raga. In the Carnatic music tradition the compositions are in the form of kriti, varanam and padam. Methods Computer methods As technology has developed in the 20th and 21st century, new methods of music composition have come about. EEG headsets have also been used to create music by interpreting the brainwaves of musicians. This method has been used for Project Mindtunes, which involved collaborating disabled musicians with DJ Fresh, and also by artists Lisa Park and Masaki Batoh. Structure Compositional instrumentation The task of adapting a composition for different musical ensembles is called arranging or orchestration, may be undertaken by the composer or separately by an arranger based on the composer's core composition. Based on such factors, composers, orchestrators, and arrangers must decide upon the instrumentation of the original work. In the 2010s, the contemporary composer can virtually write for almost any combination of instruments, ranging from a string section, wind