In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank. Music...

In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank.
Music is perhaps the most popular and widely practised (1)______ of fine arts, transcending all kinds of cultural and linguistic barriers.
Any form of fine art is (2)________ to master and almost impossible to perfect, and music is no exception.
Nature, it is learnt, has blessed almost two-thirds of the human race with musical ability of some sort. Music has the power to (3)______ out the deepest emotions. In fact, it is a magic medicine, and many seek refuge in it when they are depressed or stressed.
It is this intimacy that makes us listen to music (4)______ even hum or sing sometimes. This singing, or realistically speaking, expressing one’s emotion musically sometimes takes a serious turn.
The desire to sing before an audience is innocent and beautiful, and indeed, it is perfectly alright to have such a genuine desire. But it is also important to understand that singing is an (5)________ art—a highly refined one at that, which requires systematic, prolonged and strict training to be acceptable.

Choose the most appropriate option to fill in blank no. 4.