In 1984 , Roos took part in the German national final for the Eurovision Song Contest for the fifth and last time so far and she sang herself to victory again : " Aufrecht geh ' n " narrowly won the ticket to the Eurovision Song Contest 1984 . At the contest , the song only received 34 points and finished 13th among the 19 contestants . Mary Roos was blamed for a bad vocal performance which she says was caused by an emotional crisis after her separation from her husband Werner Böhm . " Aufrecht geh ' n " would also be her last appearance in the single charts until 1999 , when she released a German cover version of Cher 's song " Believe " ( " Leider lieb ich dich immer noch " ) . Today , she still has many live concerts and is said to be one of the most-booked singers of the schlager genre . In 1985 Roos covered some C. C. Catch and Modern Talking 's songs in German , including You 're My Heart , You 're My Soul called '' Ich bin stark , nur mit Dir '' , I Can Lose My Heart Tonight etc
Eurovision Song Contest 1984
Eurovision Song Contest 1984
Mary Roos