"can y0u hear me n0w" still remains my favorite song to ever come from Homestuck/the Homestuck fandom, period. It has a lot of amazing official music and equally amazing fan music in its vein, and I'd been a fan of its music long before I ever became a fan of the comic, but that was the song that finally pushed me over the edge and 100% on board with giving Homestuck a legitimate shot, "official" or not.
I probably wouldn't be into it at all had I not heard the song. Not only did I think it was beautiful, but the more I listened the more I became interested in the context, and as more and more friends of mine started getting into Homestuck as well... well, it wasn't long before I was giving it a shot and falling in love as well. Aradia also ended up becoming more of a favorite of mine than I think she would've otherwise because of it, too.
But what's more amazing is that it's an original composition. Really beautiful stuff, and it really goes to show what sort of creativity Homestuck can inspire and the level of talent its fans can have. Even now, I can still just sit here and loop it for hours...