LONDON (REUTERS).- Berlin-based Susan Philipsz, whose artworks center around recordings of her voice singing folk songs in public spaces, is one of the four nominees for Britain’s top art award. The Turner Prize, awarded to British artists under the age of 50 for an outstanding exhibition or other presentation, is handed out annually and traditionally attracts popular debate about the nature and role of art. Philipsz, 44, was nominated for presentations of her work at the International Festival of Visual Art in her native Glasgow and in Mirrors at the Museo de Arte Contemporanea de Vigo in Spain. “Whether encountered in a stairwell, supermarket or on a promenade, the artist’s voice interjects through the ambient noises of the everyday, often eliciting collective and subjective recollections or meditative introspection,” Tate Britain, which runs the Turner, said on Tuesday. Also on the shortlist is the Otolith Group comprising