What is the violin crying about?

.
The sad and autumn season comes once more,
And raindrops drum on rooftops till the morn.
Somewhere along deserted streets at night,
A violin cries softly in the quiet.
That mournful wail, so weary and so pale,
Is played by some ghost violinist frail.

Chorus:
Who sings to us while hiding from the wind,
Of warming fires glowing in the night?
And who recalls those summer days long lived,
When all were happy, lost in love’s delight?

2.
Or maybe they are shadows from the past,
Still weeping that return can never last.
Their voices mingle with the falling rain,
Together we will sing this song again.
The bow glides on and pours its living pain,
Like slender knives that pierce the heart again.

Chorus:
Who sings to us while hiding from the wind,
Of warming fires glowing in the night?
And who recalls those summer days long lived,