There are so many! From my personal self, loving Hedley, I would give out Marianas Trench, Simple Plan, Relient K, The overunder, and so many others! If you really want to get a good feel for similar...
You could use the name they went under in their early stages at a competition: Rocket Baby Dolls.
My Morning Jacket, Jayhawks, Wilco, Son Volt, Whiskeytown...
Yes, they did the song, The Weight. The documentary "The Last Waltz" is about their last show together.