Who isn't an American pop singer?

Many notable artists from various genres and countries are not American pop singers. For example, renowned British musicians like Adele and Ed Sheeran, or Canadian artists like Drake and Justin Bieber, may be associated with Pop Music but are not American. Additionally, artists from other genres, such as classical, jazz, or folk, like Yo-Yo Ma or Joan Baez, also do not fall under the category of American pop singers.