In my younger years, Linkin Park was my go-to band. Their lyrics were always powerful yet sad/angry in some way, and it really hit home for me.
But, I think a song that really changed me was Second Chance by Shinedown. Another song with strong lyrics, Second Chance sort of illustrated the ideas and feelings I had way back when, about how you shouldn't let your "one and only voice" go unheard because you're afraid of what others think of it -- and that sometimes, we have to make hard decisions in the hopes that we find something better come from the struggle. Because... Sometimes, goodbye is a second chance.