Relient K is something of a rarity, and one of very few bands able to transcend the Christian Rock label and enjoy mainstream success. Two songs on the pop punk quintet’s 2004 album Mmhmm, “Be My Escape” and “Who I Am Hates Who I’ve Been,” appeared in the Top 40, MTV’s TRL Top 10, and the omnipresent Now That’s What I Call Music! compilations. While the band once wrote about high school dances and Thundercats, it’s matured a little bit, while still maintaining a Blink-182-influenced brevity. After the refreshingly optimistic songs that make up 2009’s Forget And Not Slow Down, Matt Thiessen and company released two EPs of covers, collected as the 2011 album Is For Karaoke.