One of the best parts of Nintendo's Animal Crossing series is Kazumi Totaka's serene, beautiful background music, which changes based on the time of day you play. Animal Crossing Music, a fan-made extension for Google Chrome, duplicates that functionality right in your web browser. Once installed, the extension adds a small icon of K.K. Slider to the upper-right corner of Chrome. Best of all, the extension includes the soundtrack for every Animal Crossing title released so far, so you can pick the one you're most nostalgic for. By default, it'll even play random songs by K.K. Slider on Saturday nights, mimicking the charming dog's in-game concerts.

Source: Yahoo Music
Link: Real-time Animal Crossing music, right in your browser