FRANKFURT, June 22, 2016 (Xinhua) -- Alexander Kilian, member of "Café del Mundo" is seen while performing during Rheingau Music Festival at the Winery Fritz Allendorf, Oestrich-Winkel, Germany, on June 21, 2016. The 29th Rheingau Music Festival is held from June 18 to August 27. (Xinhua/Luo Huanhuan)