Rammstein Seemann

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I was jumping around in You Tube and came across a video of a group( person) Rammstein doing a song in German called Seemann. I do not understand all the lyrics( my german is rusty) but I like the song. Alot. So much so I am playing it over and over, the video version and the live version. My question is , A) have you heard of this group/song? and B) do you get obsessed over a song?