It's Yui Hirasawa's first year in high school, and she's eagerly searching for a club to join. At the same time, Ritsu Tainaka, a drummer, and her friend Mio Akiyama, a bassist, are desperately trying to save the school's light music club, which is about to be disbanded due to lack of members. They manage to recruit Tsumugi Kotobuki to play the keyboard, meaning they only need one more member to get the club running again. Yui joins, thinking it will be an easy experience for her to play the castanets, the only instrument she knows. However, the other members think their new addition is actually a guitar prodigy...
The Dismissed Club!
Rooming Together Again!
Fuyu no Hi!
Yui's Curiosity Series
DVD Episode 1
Ricchan's Kodac Moment Series
DVD Episode 2
DVD Episode 3
DVD Episode 4
K-ON's Uninhabited Island Series
DVD Episode 5
DVD Episode 6
"Cagayake! GIRLS (5-nin Ver.)" by Aki Toyosaki with Yoko Hikasa, Satomi Satou, Minako Kotobuki and Ayana Taketatsu (eps 9-13)
"Don't say ''lazy''" by Yoko Hikasa with Aki Toyosaki, Satomi Satou and Minako Kotobuki
The song played by Tsumugi, Ritsu, and Mio for Yui in episode 1 is named "Tsubasa o Kudasai."
In episode 1 at 13:54 the character Yui was imagining is Krauser from Detroit Metal City. "Satsugai suru zo" is the famous catchphrase said by Krauser in Detroit Metal City.
In episode 2, while Yui is picking a guitar. The guitar's brand is Fender. When Yui brought the guitar to school the brand is changed to Gibson.
In episode 2, while Tsumugi is asking the employee for a discount on the guitar, you can see on the background a logo of Peart, instead of Pearl. Peart was taken from Neil Peart, drummer of a Canadian rock band named Rush.
In episode 5, Yui together with Sawako-sensei both smiled with their tongues stick out is based on the smile from the popular Fujiya Peko-chan Milky Candy.
In episode five, Mio is seen wearing a pair of AKG k701s (highly popular reference headphones among audiophiles).
In episode 6, around 05:43, Yui stumbles on Tomoya from Clannad, to who she apologises "Oniichan, gomen yo." (Sorry, mister.)
In Episode 6, when Ritsu is practicing to MC, she introduces Yui with the phrase, "All your sweets are belong to me." This is a parody of a mistranslation of the European Sega Mega Drive version of the video game "Zero Wing". The original phrase is : All your base are belong to us.
In Episode 6, when Mio trips on the wire and falls to the ground, it is implied that her panties were showing. When focusing on the bowl of rice, the sound of "Ara" parodies the one in Sayonara Zetsubou Sensei when there is panty-flashes.
Error in Trivia on Ep2 of K-On! Yui does not look at or purchase a Fender guitar. She looks at and purchases a Gibson. That's why she brings a Gibson to school. The one who looks at a Fender is Mio when she reminisces about purchasing her bass guitar which is a Fender.
The strap Yui bought in episode 7 for Christmas can be seen on Ritsu's bag in episode 13.
In Episode 5, the guy Sawako Yamanaka sensei was trying to impress in her flashbacks is or looks like Soichi Negishi from Detroit Metal City. Notice that he has the same hairstyle as Negishi and he also wears nearly the same clothes as Negishi in Detroit Metal City The Movie, which is a vertically stripped T-shirt with blue jeans.
In episode five, Sawa plays the guitar with her teeth after she is handed a guitar by Yui. This is a direct reference to one of the moves Krauser of Detroit Metal City uses when he plays his guitar.
In K-On! OVA, after their live house concert, in Yui's house Sawako-sensei attempts to make Azusa wear a cosplay costume of Lum's tiger bikini. Lum is the main character of Rumiko Takahashi's classic manga Urusei Yatsura.