So is "SIR SLY" read like "seriously" or "sir sly"?

The grainy sound of his voice and the piano are fun, reminds me of a more dance-y Edward Sharpe. What do you think?
Regardless, I at least know they are pirates. Both the "Easy Now" and "Gold" music videos feature a never ending stream of sailing through the water. Made me remember those days out on the deck of the MV explorer, when I most missed my loved ones back home. (listen to "Ghost" with the video of "Easy Now" playing muted to feel it)