Teardrops on my pointe shoes, guitar and mask

During a mass Jrock concert with Alice Nine, Miyavi and the GazettE, the GazettE and Miyavi hear a beautiful voice coming from a dressing room. They open the door to find three european girls, one singing and playing the guitar, another one crying and putting make-up on her face and a last one with a gloomy look on her face putting bandages on her feet and hands. Who are they?