I loved when Hal was dancing to Funkytown in the Rollerskating episode.
Oh and when Dewey and his babysitter was dancing to Fernando by ABBA in the Water Park episode.
Hi! I loved when Reese and Malcolm was dancing adn singing to "Take a chance on me" in "Pearl Harbor" episode. (Season 6 Episode 4)
I'm also partial to the song that plays at the end of the Pilot and Graduation episodes, it always makes me think of the show, and makes me a bit sad TBH. And you can not know the title theme, i find it to be a great song, and it brings me back to when the show was first on, thats for sure.