This week Ravinia’s Steans Music Institute (RSMI) welcomed 14 of the world’s most talented professional musicians to its summer conservatory program for singers. They’ve come from Australia, Canada, Germany, Norway, Poland, South Africa, South Korea, Ukraine, the United Kingdom and, of course, the United States. They will participate in a free, public master class with James Conlon at 2 p.m. on Friday, Aug. 1, in Bennett Gordon Hall. View a full list of concerts and master classes to be given by the RSMI class of 2014.