Black Hills High School alums Riana and Derik Nelson perform a selection of their music during a January 9th appearance at their alma mater with pianist Brian "Theory" Hargrove and guitarist Jack Kovacs.The siblings are working in Hollywood, and have returned to their former school for a day to perform at assemblies and encourage kids to follow their dreams, with Derik currently playing in the house band for the television show Glee.STEVE BLOOM/staff photographer