Nick , go to Ultimate Guitar site. search Boulevard of Broken Dreams and click on chords from the menu right below all the ads. The lyrics will come up with all the chord changes and might be in who-knows-what key at first (Fm probably), but you can change it to any key - here's how: click on the 2nd one down the list, below the "official version created by UG.."

Now, look at bottom of page where it says Transpose. keep hitting the - or + till you get to the chords Em G D A, then learn it. The song is in a minor key so I don't think you'll find it in key of E. The band most likely plays it in Em. Good luck!