"I Am Stretched on Your Grave" is an Irish song sung by Grace Burgess in Episode 1.5 She sang this song to the customers from The Garrison Pub, including Thomas Shelby.  The lyrics are as follows:

“…When my family thinks

That I’m safely in my bed
Oh, from morn until night
I am stretched out at your head
Calling out unto the earth
With tears hot and wild
For the loss of a boy
That I loved as a child
So I am stretched on your grave
And I’ll lie here forever
If your hands were in mine
I’d be sure they would not sever
My apple tree my brightness
It’s time we were together
For I smell of the earth
And I’m worn by the weather.”
This song was recorded by Irish singer Sinead O'Connor on her second album "I Do Not Want What I Do Not Have" released in March 1990.  It was previously set to music by Phillip King, and has been recorded by various additional artists. 

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