For me, this song is about depression, and
thoughts arond other mental illnesses.
In the song the lead singer sing "I`ve hav enough, there`s a voice in my head, says I`m better left dead. " Whitch to me sounds like he`s suicidal. And then they sing "But if I sing along, a little f***ing loud to a happy song, I`ll be allright. So if you`ve experienced depression you would know that singing to a happy song will not make you feel better. "Just sing relly loud to a happy song, you`ll be just fine!" Is something litterally EVERYONE with no exerience around depression will say to a depressed person. I hope this made some sence..