Another theory is that the ancient veenas like the rudra vina were the parents of the sitar. The rudra vina is clearly a stick zither which is in contrast with the sitar which is a lute. Other than that, the materials and construction of the two instruments were also different so this theory is not likely to be true. Construction A constant air supply is provided by the bagpipe s construction. The air flow could be maintained in the chanter and drone pipes through using the left hand to squeeze the bag during breathing periods. In the mouthpiece, there is a circular piece of leather attached to the bag that operates like a one way valve. He created a bowl-shaped head connected to a cylindrical center with large finger holes and open-standing keys. Minor developments have been made after that. Flute Construction Modern flutes are often around twenty-six inches long and 0.75 inches wide. There are two open ends which makes it an open cylinder. In the beginning of the 19th century, the harmonica s popularity grew and was established in Europe. It is invented by Christian Friedrich Ludwig Buschmann. Parts of the harmonica Most modern harmonicas have 5 common parts mouthpiece, comb, reed-plate, windsaver, and cover plate. The mouthpiece is found on the side of the harmonica between the player s lips and the air chambers. It often does not need any accompanying instrument because the performer could play music on keys using the right hand and the accompaniment which has pre-set and bass chord buttons using the left hand. Air flow through reeds is generated by expansion and compression of the accordions bellows. A keyboard or a set of buttons handles which reeds will accept air flow which produces the tones. The strings all have the same length so variation in pitch is either accomplished by different sting thickness or by different sting tensions. The strings are made of gut. Gut is a cord made from the natural fiber in the animal intestines walls. The string with the deepest note is placed farthest away from the player.