Available choices:
I. Classical.
II. Metal.
III. Hip-hop.
IV. Opera.

Read the following article and answer the question. Article: There are many different kinds of music in the world . Let's read some kinds of them . Classical Music Classical music is a form of music needing high musical skills . If you wish to learn this kind of music , you have to go through proper training . Metal Music Metal music came out after the Second World War . The melody of the song is heavily influenced by the structure for it . It is also know as " information music ". While in metal music , songwriting is based on(......)a form . Hip-hop Music This music always includes the use of instruments such as the guitar , violin , piano , bass , drums and so on . In this type of music , the bass is the main instrument . It was first played by a group of travelling singers and poets of West Africa . Opera Music It first appeared in Italy in the 1600s . It has a great mixture of theatrical art and musical invention and is used to playing in the theaters . Jazz Music This type of music has strong and complex melodies . The main musical instruments are comet , trumpet or violin , that help carry the melody . Besides these , there are many others such as the blues , new age music , Celtic music , religious music and chamber music . Question: _   Music needs high musical skills . Answer:
Answer:
I.