This weekend, as everyone on the planet heads to theaters for 'Iron Man 3,' the 15 men on this list won't be among the popcorn-gobbling masses. Why? Because they're the Iron Men of Rock -- singing, strumming lifers who haven't got time to watch Robert Downey Jr. fly around and blow stuff up. They've got shows to play and songs to write, and we, alongside our partners at Loudwire and Ultimate Classic Rock, salute them all for forging fruitful careers that have spanned decades. As you click through our Iron Men of Rock gallery, keep in mind that all of these musicians have soldiered on without the use of metal suits or fancy gadgets -- just simple instruments and true grit.