It is a song about fear. Something big is coming. It's cynicism that in the moment of fear when people run for their lives some make a picture, maybe a selfie, to publish in a tweet. Listen to these effects:
"People suppress tears, shrug shoulders and resign": Git&Bass is suppressed too
"But the more that jump on the more it sinks down": The pitch sinks / deceases too.
"The crowd starts a stampede": Drums express the stampede

Dark Wave

Dark is the horizon, we're agitated by sudden fear
All eyes are focused on what is rolling near
Some run, some freeze, and some forsake their love
Birds flutter up. What a view from above!

Is it a menace or gloomy shadows from the past
We will find out but won't appreciate at last
People suppress tears, shrug shoulders and resign
Wiggle their ears, mumbling, it was only a matter of time

A ship! A ship! The crowd starts a stampede
Some take pictures to publish in a tweet
But the more that jump on the more it sinks down
The captain with his white gloves is the last that will drown

Ref:
A dark wave is breaking in
A dark wave is breaking in

Epilog:
Mothers, get back on your feet
And take the children from the street


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Music and lyrics: Henk Freytag
Publisher: HEINZ RIEMER MUSIC
Registered at ASCAP
ISRC: ATI241600005

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Album "Boheme"