Want to show your employees just how much you appreciate their efforts? Think music. For the second time in little over four years, duct-tape manufacturer Manco Inc., now part of the German-based Henkel Group, has rewarded its employees, their families, and key partners with a memorable musical. Earlier this month, chairman and CEO Jack Kahl rented one of downtown Cleveland's palatial theaters and brought in three Broadway singers for a free concert as a way to say "thanks."