Bulgarian singer hits high with record-breaking vocals Smilyana Zaharieva knew she had a gift when she saw her audience tremble or cry during her performances. Now an official Guinness world record confirms that the Bulgarian singer has one of the most powerful voices on the planet, which can stay pitch perfect despite being as loud as a rock concert. Zaharieva now wants to explore the curative effects of sound 'to help people and find a message to convey'. IMAGES AND SOUNDBITES