street musician

The story is about an old street musician who wants to be famous and be loved as a violin player to people.
One day, when the old man is sad, somebody comes to him and gives him an elixir. The elixir gives the person who drinks it, a power to attain his/her desire in exchange of the one most important possession he/she owns.
The old man agonizes whether to drink it or not, but he succumbs to its temptation. He drinks it and then...