Grojband books a gig at the carnival and they hear that the famous celebrity Chip Chunkley is going to be there. They want to impress him with their music but they don't have lyrics for a new song so they try to get some by ruining Trina's date with Nick Mallory.
A wildly famous celebrity named Cherry Grapestain has arrived in Peaceville for the premiere of her new movie at the drive in. Corey wants to get his band noticed by her so that she will put them in her next movie trailer.
The Halloween Dance is taking place at Elementary High and Grojband has booked a gig to play there. Unfortunately, they have no lyrics, and, to make things worse, music from a cursed amp Corey found causes a zombie outbreak.
Corey sends the band to a concert played by his favorite childhood animatronic band. This band gets destroyed under the hands of Trina, so he decides to have his band fill in for them as he makes Grojband a puppet band.
Kon has to learn three years worth of math in order for the band to play at the Triathlon and he finds out that he enters a genius trance by drumming. Meanwhile, Trina dresses up as her nerdy alter-ego known as Trigonometrina who enters the Trimathalon to compete against Kon.
The biggest cake in the world arrives in Peaceville and Grojband plans on eating it. To do so, they need to sing at a wedding for Barney's daughter Barnera. Corey and Laney have to pretend to be dating so that they can fall in love with each other but Kin and Kon keep interrupting them. Meanwhile, Trina is heartbroken after she outgrows her sweater, Pinktacular.
Corey loses his voice just before their gig at the Swiss Party. So Kin builds him an auto-tuned helmet to make it sound better. Trina ruins it for him by making the helmet get an evil mind if it's own and having it perfect everything. She also plans on cheating in a raffle to win a chocolate diamond.
Grojband goes vegan so that they can play music at a Salad Bar, but Trina's science project comes to life and turns evil and Grojband has to stop it. However, Corey is hypnotized by it causing him to turn on his own friends and join forces with the evil plant.
Grojband goes to Camp Screamleay to play music in a scary song competition, only to figure out that their opponents are The Newmans. If they want to beat them at writing a scary song, they need to get help from a legendary campfire monster known as Blade Stabbington. Meanwhile, Trina tries to get closer to Nick Mallory by becoming head councilor of Camp Screamleay.
Grojband uses Kin's time machine to see what music is like in the future. However, they get trapped in a horrible future where an evil cyborg Trina rules Placerville and has put a ban on music everywhere.
Corey buys a new guitar which seems to be evil and has a mind of it's own. The guitar plans to destroy all other sources of music in the world and has held Corey captive. It's up to Kin, Kon, and Laney to save him.
All of the season 2 episodes have been released in the Cartoon Network website, and later aired on Boomerang on January 10, 2015 In Australia the Season 2 episodes are counted into Season 1 making them both an entire 52 episode season.
The citizens of Peaceville have a ceremony where everyone celebrates the day Peaceville was founded. They find out that the Peaceville national anthem was stolen from the Mallories by the Riffins and complete chaos breaks out.
Grojband adopts a dog names Snarffles from the animal shelter and they decide to make viral videos about him. Meanwhile, Trina adopts a kitten named Wheelie which she uses as an evil campanion to destroy Grojband and Snarffles.
It's Valentines Day and Grojband sends out cards to everybody in Peaceville that had their song recorded on it. However, Trina recorded over their songs with a horrified scream which causes everyone in Peaveville to hate each other.
It's new years eve in Peaceville and at the celebration, Grojband plans on playing a new song at the turn of the new year. Unfortunately, they get cursed by a Rock legend known as The Metrognome which causes them to do everything off timing.