Use headphones for a better experience. Drag and drop an icon on a character to have him sing. Drag down (not click, that's just mute) a character to have him stop singing.
"Guys, I think we're Homestuck." This sounds a bit too happy for a Homestuck mod Audio sample: https://www.youtube.com/watch?v=jAJHgXKT2YI (it's so perfect) I like Terezi's sound even if it's just a simple layered arpeggio