Erika was written by German composer Herms Niel in the 1930s and published in 1938, taking its title from both a heather flower and a woman's name. It became one of the best known German marching songs of the Second World War era and survived in recordings, films and military collections for decades afterwards. Short excerpts resurfaced online much later, first in history edits and then on TikTok, where the instantly recognisable chorus made it easy to reuse as a ringtone, joke soundtrack and short viral clip.