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The album Mmhmm (2004) marked their commercial and artistic breakthrough. Released through , it featured glossy production and deeply personal lyrics. Singles like "Be My Escape," "Who I Am Hates Who I’ve Been," and the high-speed "The One I'm Waiting For" propelled the album to Gold certification (500,000+ units). It remains their best-selling work. Maturation and Five Score and Seven Years Ago (2007–2011) After the Apathetic EP (2005), the band released Five Score and Seven Years Ago (2007)—a title referencing the band’s then seven-year existence. The album showed significant musical growth, mixing punk energy with classic rock and piano balladry. The lead single, "Must Have Done Something Right," became their biggest mainstream hit, while "Forgiven" and "Deathbed" (a 10-minute epic featuring Switchfoot’s Jon Foreman) showcased new depth. Drummer Dave Douglas left in 2008 and was replaced by Ethan Luck (ex-Demon Hunter, O.C. Supertones). Forget and Not Slow Down (2009–2015) Widely considered their artistic peak, Forget and Not Slow Down (2009) was a deeply emotional, narrative-driven album about heartbreak, recovery, and moving on. Thiessen’s fiancée had left him, and the album chronicles his grief and healing. Songs like "Forget and Not Slow Down," "Therapy," and "Savannah" are fan favorites. Despite critical acclaim, it sold fewer copies than Mmhmm , leading to Capitol dropping the band.

The band then released Collapsible Lung (2013), a controversial, synth-heavy pop album that divided fans. While containing the catchy hit "Don’t Blink," many longtime listeners disliked the departure from their rock roots. Thiessen later admitted the album was made during a period of personal aimlessness. Returning to an indie model, Relient K released Air for Free (2016) on their own Mono vs. Stereo label. The album was a return to form, blending folk, indie rock, and their classic pop-punk energy. It received positive reviews but minimal promotion. relient k wiki

In 2003, Two Lefts Don't Make a Right...but Three Do saw the band refining their songwriting. The album included the poignant "Getting Into You" and the hilarious "I So Hate Consequences." The album Mmhmm (2004) marked their commercial and

left the band in 2004 (later becoming a landscaper and a Christian pastor) and was replaced by Jon Schneck . It remains their best-selling work