It is widely considered a masterpiece of Bulgarian melodic rock from the late 1970s and early 1980s.

Could you clarify if you are looking for the of the Diana Express song, or if you are researching the literary concept for a project?

In a broader sense, "v byalata noshh" can refer to the phenomenon of (common in northern latitudes like St. Petersburg or Scandinavia) where the sun doesn't fully set. In literature and art: