According to this article:
http://de.wikipedia.org/wiki/Grand_Prix_der_Volksmusik_1989
HÖRST DU DIE GLOCKEN VON STELLA MARIA, sung by Edith Prock, was one of the competing songs in the contest called the Grand Prix der Volksmusik in 1989. Incidentally it identifies the songwriters: George Martin Lange (words) and Herlinde Grobe & Ady Zehnpfennig (music).

According to this article:
http://de.wikipedia.org/wiki/Bianca_%28S%C3%A4ngerin%29
Herlinde Grobe is the real name of a singer/songwriter who performs as "Bianca."

She is listed in the "Schlager" category.

"Stella Maria Maris" is a phrase I find in lots of places; it is even reported as being inscribed on certain old church bells in England.