Song that starts around 45:30
Can't find it on soundtrack lists given on the internet.
shareJuan Llossas Tango Orchestra: Fruhling und Sonnenshein (Spring and Sunshine).
"Spring and Sunshine/Your love should be to me/What in dreams I never hoped for/That's what your kiss told me."
http://www.youtube.com/watch?v=L1rNuzYsWlc