Appalachian State University’s annual summer arts celebration, An Appalachian Summer, presents the beloved singer-songwriters team Joan Osborne and Lisa Loeb, two unmistakable voices of the ’90s, for a special evening marking the 30th anniversaries of their breakthrough albums — Osborne’s Relish and Loeb’s Tails — Friday, July 11 at 7:30pm at the Schaefer Center for the Performing Arts.