It’s the first Monday in September and that can mean only one thing – Happy Labor Day! A tribute to working Americans who help keep the country afloat, this day is for you – so sit back, relax and enjoy. Some equally hard-working rockers have taken to Twitter to share their well wishes today. Everyone from Gavin Rossdale of Bush to Poison's Bret Michaels and Korn checked in, see what everyone had to say below.