Ottoman military bands are thought to be the oldest variety of military marching band in the world. Though they are often known by the Persian-derived word mahtar (مهتر; mehter in Ottoman Turkish) in the West, that word, properly speaking, refers only to a single musician in the band. In Ottoman, the band was generally known as mehterân (مهتران, from the Persian plural mahtarān), though those bands used in the retinue of a vizier or prince were generally known as mehterhane (مهترخانه, meaning roughly, "a gathering of mehters", from Persian "house of the mahtar"). In modern Turkish, the band as a whole is often termed mehter bölüğü ("mehter company [troop]"), mehter takımı ("mehter platoon"). In the West, the band's music is also often called Janissary music because the janissaries formed the core of the bands.

It is believed that individual instrumentalists may have been mentioned in the 8th century Orkhon inscriptions.^{[citation needed]} Such military bands as the mehters, however, were not definitively mentioned until the 13th century^{[citation needed]}. It is believed that the first "mehter" was sent to Osman I by the Seljuk Sultan Alaeddin Keykubad III as a present along with a letter that salutes the newly formed state. From then on every day after the afternoon prayer; "mehter" played for the Ottoman ruler. The notion of a military marching band, such as those in use even today, began to be borrowed from the Ottoman Empire in the 16th century. The sound associated with the mehterân also exercised an influence on European classical music, with composers such as Joseph Haydn, Wolfgang Amadeus Mozart, and Ludwig van Beethoven all writing compositions inspired by or designed to imitate the music of the mehters.

A military band originally was a group of personnel that performs musical duties for military functions, usually for the armed forces. A typical military band consists mostly of wind and percussion instruments. The conductor of a band commonly bears the title of Bandmaster or Director of Music. Ottoman military bands are thought to be the oldest variety of military marching band in the world, dating from the 13th century.

The military band should be capable of playing ceremonial and marching music, including the national anthems and patriotic songs of not only their own nation but others as well, both while stationary and as a marching band. Military bands also play a part in military funeral ceremonies.

There are two types of historical traditions in military bands. The first is military field music. This type of music includes bugles (or other natural instruments such as natural trumpets or natural horns), bagpipes, or fifes and almost always drums. This type of music was used to control troops on the battlefield as well as for entertainment. Following the development of instruments such as the keyed trumpet or the saxhorn family of brass instruments, a second tradition of the brass and woodwind military band was formed.

The history of military of the Ottoman Empire can be divided in five main periods. The foundation era covers the years between 1300 (Byzantine expedition) and 1453 (Fall of Constantinople), the classical period covers the years between 1451 (enthronement of Sultan Mehmed II) and 1606 (Peace of Zsitvatorok), the reformation period covers the years between 1606 and 1826 (Vaka-i Hayriye), the modernisation period covers the years between 1826 and 1858 and decline period covers the years between 1861 (enthronement of Sultan Abdülaziz) and 1918 (Armistice of Mudros).

The earliest form of the Ottoman military was an steppe-nomadic cavalry force. This was centralized by Osman I from Turkoman tribesmen inhabiting western Anatolia in the late 13th century.

These horsemen became an irregular force of raiders used as storm troops, armed with simple weapons like bows and spears. They were given fiefs called timars in the conquered lands, and were later called timariots. In addition they acquired wealth during campaigns.