1. The violin (Italian: Ilviolino) is a string instrument. There are always four strings. The sound is produced by the friction between the string and the bow. The violin body (singing box) is about 35.5 cm long and is made of curved panels, back panels and side panels.

2. The piano (Italian: pianoforte) is a keyboard instrument in Western classical music and is known as the "King of Instruments". It consists of 88 keys (52 white keys, 36 black keys) and a metal string soundboard. Italian Bartolomeo Christofori (1655-1731) invented the piano in 1709.

3. The guitar is a plucked instrument, usually with six strings and similar in shape to a violin. The guitar is often regarded as the main instrument in pop music, rock music, blues, folk songs, and flamenco. In the field of classical music, the guitar is often performed as a solo or duet; of course, in chamber music and orchestral music, the guitar also plays a considerable role as a foil.

4. Erhu (Pinyin: Erhu) began in the Tang Dynasty and was called "Xi Qin". It has a history of more than a thousand years. It is a traditional Chinese stringed instrument. Erhu, the two-stringed huqin, also known as "Nanhu" and "Omzi", is one of the main bowed string instruments (stringed instruments) in the Chinese national musical instrument family.

5. The flute is the main high-pitched melody instrument in modern orchestral music and chamber music. Its appearance is a long cylindrical tube with several sound holes. Early flutes were made of ebony or coconut wood. Modern flutes are mostly made of metal, such as relatively low-grade brass, white copper, ordinary nickel silver alloy to professional silver alloy, 9K, 14K, 18K, 20K, 24K gold and platinum. Flute etc.