In no particular order, they are all amazing:
Diana Krall, Roxanne Potvin, Diana Wynter Gordon, Marina Celeste, Lady Gaga, Christina Aguilera, P!nk, Sandra Szabo, Donna Summer, Dream (band), Carly Rae Jepsen, Avril Lavinge, Gwen Stefani, Natalie Imbruglia, Madonna, Taylor Swift ... etc.