In what year was the album “Muss laut sein” released by Grossstadtgeflüster?

In what year was the album “Muss laut sein” released by Grossstadtgeflüster?: The album “Muss laut sein” was released in 2007 by Grossstadtgeflüster, featuring 14 tracks.
What is the most successful song from the album “Muss laut sein” by Grossstadtgeflüster?: “Wann dann” is the biggest hit from the album “Muss laut sein” by Grossstadtgeflüster.

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