If you wanna play the song easily like I wanted to you only need 3 chords.
listen to the song to know when to change chords and how the rythm is going.
Fifteen men on the dead man's chest
Drink and the devil had done for the rest.
The mate was fixed with the bosun's pike
and the bosun brained with a marlin-spike.
Cookie's throat was marked belike
It had been clutched by fingers ten.
And there they lay, all good dead men,
Like break o' day in a boozing den
Yo-ho-ho and a bottle of rum!
That's all you need for the song! The rest of it is just the same. Atleast now it should
easier for you to listen to the song and put in the right chords.