Sea Out-Guillemots

One of my favorite songs...I love the lyrics but I still don't fully understand them.

Oh, Marbella's on the run
In her eastern overcoat
Used to wear a light bulb dressing gown
Turn it on, then tear it down
Before we went to sleep

So Marbella upped and left
A tuba in a treble clef
Couldn't walk, she wouldn't cry
Dreaming was their only time
And dreams are half asleep

When they go sing out, sea out, sea out, sing out, sing out now
Sea out now, sing out now
Sing out, sing out, sing out, sing out, sing out now
Sea out now, sing out now

So a washed up carnival has just reduced me to my bones
I never did the washing up
I loved the stains on every cup
They were the only hint I had

Now Marbella's gone astray
Somewhere in this black'ning Milky Way
I used to colour in the holes
Now I leave them blank
Now it's only spaces I have cause to thank

Sing out, sing out, sing out, sing out, sing out now
Sing out now, sea out now
Sing out, sing out, sing out, sing out, sing out now
Sing out now, sing out

Well, Marbella is my guest
I treat her just like all the rest
Whisper fairytales of Neverland
Throw the pennies in her hand
Stroke her hair and tell her I've been cheating

Sing out, sing out, sing out, sing out, sing out now
Sing out now, sing out now
Sea out, sea out, sea out, sea out, sea out now
Sing out now, sing out now