Berlin is the 1st single from Finnish "darkwavepoppers" Rain Diary and their 2nd album, Black Weddings. The song is highlighted by the trademark "Nordic sound", poppy elements jointed into somewhat melancholic lyrics and backgrounds. Rain Diary has been referred to bands like Depeche More and HIM due to their touch to music: Killing hooks and melodies.

Even though the name Berlin itself serves as a parabola to attachments & addiction, the song draws its inspiration from the time when Rain Diary's singer Tommi Suomala moved away from Finland to find his home in Berlin. The time lived & loved in Germany reflects to the whole album and "the mental flesh" is especially on disposal in Berlin.