Musicians perform during a cruise concert in Ljubljana, Slovenia, June 29, 2020. As part of the 68th Ljubljana art festival, the cruise concert is staged from June 29 to July 1. (Xinhua/Peng Lijun)

Musicians perform during a cruise concert in Ljubljana, Slovenia, June 30, 2020. As part of the 68th Ljubljana art festival, the cruise concert is staged from June 29 to July 1. (Xinhua/Peng Lijun)

Musicians perform during a cruise concert in Ljubljana, Slovenia, June 30, 2020. As part of the 68th Ljubljana art festival, the cruise concert is staged from June 29 to July 1. (Xinhua/Peng Lijun)