The body is made of two wooden boxes joint by bellows. In these are the reed chambers which produce sound. The pallets are valves that control air passing through to the reeds. The pressing on the key raises the pallet which allows air to enter the reed chamber and air flow stops as the key is released. It is stated by the Sangeet Sudarshana that the sitar was invented by Amir Khusru in the 1700 s. The Persian setar was his basis for naming this instrument. There are a lot of theories about the origin of the sitar. Unfortunately, most of which are historically inaccurate and, thus, impossible. The most common theory is that Amir Khusru invented the sitar around 1300 AD. Variations in construction In choosing snare drum, you should consider which musical genre you would like to play so that you would match this with the right construction. The material of the snare drum has a huge effect on sound production. Brass snare drums add an especially sharp edge and also are rich with soft overtones. Lastly, never share your harmonica with other people. Choosing your harmonica When choosing your harmonica, you should keep these in mind. Wood harmonicas may cost less and have a warmer sound but these are sensitive to moisture while metal harmonicas have higher integrity but are expensive and have more probability of corrosion. Trombone gained a higher level of significance in chamber and solo music when new composers gave it outstanding parts in their works in the second half of the century. In the second half of the century, new composers began giving back to the trombone a higher level of importance in solo and chamber music. To avoid sweat marks on your guitar, you could wear a sweat band when playing. Place it below the elbow or wherever area in your arm that rests on the guitar s side. Use a brush to buff and remove light scratches on the pickguard. If the scratch is deeper, use water sand and sand paper and micro mesh sand papers and buff the pickguard after.