Her breakthrough single was "(I'll Never Be) Maria Magdalena", released in 1985, which topped charts in numerous countries and secured her international fame.

With Michael Cretu as her manager, producer and composer, and personally a life partner, Sandra went on to score even more European top 10 hit singles, most famously "In the Heat of the Night" (1985), "Everlasting Love" (1987), "Secret Land" (1988), "Hiroshima" (1990) and "Don't Be Aggressive" (1992).

Sandra found biggest popularity in continental Europe, Israel, Japan and Brazil.

She has reportedly sold over 30 million records worldwide, which makes her one of the most successful female German vocalists ever.

[1][2] Aside from the radio edit version of Andru Donalds' "Precious Little Diamond" (2000),[30] Sandra has participated on 15 different songs for Enigma: