I thought I'd liven up my blog a tad with some K-On!, so here ya go:
"Curry Nochi Rice" by Ho-Kago Tea Time
Say what you want about the anime, but some of the music in it is pure power-pop goodness. I mean, this is the perfect power-pop song, especially the vocal melodies during the bridge. And to top it off, the keyboard just sticks in your head. I liked this song so much I even learned it on guitar, haha. (While finding this on YouTube, it seemed many others also learned it.)
Also, Ritsu saying "one, two, one two three four!"