A metaphor

I am the sorrow,
in a bird’s tune.
I am the silence,
in the dawn of night
I am the pain,
that melts people’s hearts.
I am the lost song,
that used to exist.
I am the veil,
I am the wall,
I am the silent sufferer

I am, but am I ?

[Found these words in my evernote notes, dated january 2017]