There are multiple artists with the name Blanche:

1) Ellie Delvaux (born 10 June 1999), better known as Blanche, is a Belgian singer and songwriter.
She represented Belgium in the Eurovision Song Contest 2017 in Ukraine with her song “City Lights”, placing fourth in the Grand Final. The song charted across Europe, peaking at #1 in Flanders and #2 in Wallonia. Blanche previously competed on season five of The Voice Belgique, where she was a member of Team Cats on Trees.