K-ON!! Season 2 episode #17
Sawako informs the girls that the music room will be temporarily unavailable to them.
Due to a water leak in the ceiling, the music room is unavailable for a few days, so the Light Music Club has to find another place to practice. They go around the school and find most places already reserved for another club. They attempt to play in some rooms, but end up being too noisy. The girls finally decide on a nearby recording studio, but they use up all their studio time drinking tea and discussing ideas for new lyrics. On the way home, Sawako stops them with good news: the music room is ready for use again.
Yui is tired because she stayed up all night trying to write a new song. The other girls warn her that she might catch a cold, which turns out to be true, although Ui catches the cold because she did most of the work. While Ui is sick in bed, Yui tries cooking for herself, and realizes that she won't always be able to depend on Ui to take care of her. Inspired, she writes a song thanking Ui for her constant support. The Light Music Club then decides to use it for their new song in their latest concert.