Ich kanns nicht fassen, nicht glauben is text heavy (meaning a lot of words for a short amount of music), as I think we all are when first falling in love. It makes the piece a bear to memorize, but the translation helps. I struggle with the music in this one. Maybe I'm not "getting" it, because it doesn't seem to match the text. It sounds too frantic . . . too stressed and afraid. Or maybe the music does match the text, but not the subtext that I have in my mind when singing it, which is "I can't believe he loves me, but I'm happy that he does."