Success, as the saying goes, happens when opportunity meets preparation. It’s an old saw that has proven itself time and again, especially in the performing arts. But wonderful things also happen when successful people create their own opportunities.

Which brings us to Karen Slack.

The Philadelphia-born soprano, a 2008 alumna of the Steans Music Institute at Ravinia, is a familiar presence on operatic stages throughout the United States and abroad, where her luscious, lyrico-spinto instrument has graced the music of Verdi, through Wagner, to Gershwin, Heggie, and beyond. Slack has possibly made her most notable impact, however, in her support of contemporary music. On August 1, Ravinia audiences can experience the latest of Slack’s commissioning projects with the world premiere of African Queens, a program of new vocal compositions from Jasmine Barnes, Damien Geter, Jessie Montgomery, Shawn Okpebholo, Dave Ragland, Carlos Simon, and Joel Thompson, who have grown together in recent years to become the creative collective “The Blacknificent Seven.”