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Luna Halo - On Your Side
Elliott Smith - Between the Bars (there's also a Good Charlotte cover of this song, which is also good)
Black Lab - Ghost In Your Mind
Hannah Fury - The Winner Takes It All (ABBA cover)
The Click Five - Empty
Bon Jovi - Always
Sanctus Real - Lead Me
Plain White T's - Let Me Take You There (I have very good memories associated with this song)
New Politics - My Love
Escape The Fate - You Are So Beautiful/Harder Than You Know (one of the two)
Maybe this list isn't so much about my favorite songs, but rather about the songs that have the strongest emotional impact on me (at the moment). And even then, it's not a certainty that I've chosen the right ones, because it's a very difficult task.