I built my house beside the wood
So I could hear you singing
And it was sweet and it was good
And love was all beginning
Fare thee well, my nightingale
'Twas long ago I found you
Now all your songs of beauty fail
The forest closes 'round you
The sun goes down behind a veil
‘Tis now that you would call me
So rest in peace my nightingale
Beneath your branch of holly
Fare thee well, my nightingale
I lived but to be near you
Tho' you are singing somewhere still
The red berries of the holly symbolize the blood of Jesus on the cross The holly’s pointed leaves symbolize the crown of thorns placed on Jesus' head. ( Source ] 

Nightingale