The harp did not initially have a mechanical device that gave the player a combination in different key forms, the harpist such as a wedding harpist felt the need to adjust the tone of their strings and arranged in each section. Finally, in the second half of the 17th century, a row of metal hooks was attached along the left side of the harp. The initial depiction of a harp using a frame or frame is in England in the 8th century stone age transition. Where music is an important part of the life of the ancient Irish people and the harp is an aristocratic instrument, commonly played in royal courts.
Shortly before 1720, the mechanism for the use of expanded harps was fulfilled for the harpists to fulfill their needs in playing it. Seven pedals were added to the bottom of the harp to increase pitch. The single pedal harp reached its greatest level of popularity as played in a French court by Marie Antoinette. Based on this need, Sebastian Erard managed to obtain a patent in 1810 to design a harp with a double pedal.
Erard redesigned the single pedal harp, by replacing Crochets (string nodes) with branched discs. Until now, each string is equipped with two disks, which are able to produce flat (mole), standard, or sharp (sharp) sounds in accordance with their respective pedals. This makes it very easy for players to determine their pitch standards. Harp continues to grow and has had many significant improvements in its manufacture over the past two centuries.
In the late 1800s Lyon and Healy, a Chicago-based company that still produces harps to date, had succeeded in making harps in America with very strong frames and various important improvements to be applied to the Erard mechanism, namely the application of two pedals. The 21st century gives great value and meaning to the harp, this instrument is widely played at various events or large events such as festivals, conferences, lavish government events, arts communities. So that brings a lot of opportunities to the harpist in developing his career. From medieval times to moderns, from classical to jazz, from acoustic to electric. Harp is an important musical instrument in various traditions and changes in this era.