This Tax Day, lay down your wallet and pick up a microphone. The Hard Rock Cafe is giving customers a chance to “sing for your supper” at participating U.S. locations. Guests brave enough to sing their favorite song in front of the entire restaurant receive a FREE Local Legendary Burger. You must perform the complete song to get your complimentary meal. (Participants will select from a predetermined list of songs and entrées.) Most locations are hosting the promo on April 15, starting at 6 p.m. However, dates and times may vary by location. Click here to search for locations nationwide.