"Goodbye To A World" is a song by the musician Porter Robinson and a minor meme on the SiIvaGunner channel.
"Goodbye To A World" is the twelfth and final song on Robinson's debut album, Worlds, which was released on August 12, 2014. Robinson has said regarding the song's meaning:
[...] I was very much attached to these online worlds, and MMORPGs [...] and the thing about these games is that when an online roleplaying game that millions of people are connected to goes away, when the game ceases to be profitable and the servers shut down, it's not like other games where ten years down the line you can just plug in the cartridge and bask in the nostalgia. It's not like that. Once those games are gone, those worlds that you've very much immersed yourself in are gone, and that was a big deal to me when my favorite games disappeared and I couldn't go there anymore, and as an adult now, I think it's just a very kind of romantic notion. That's why I think the whole idea of, like, a beautiful apocalypse is really evocative to me, I love that. [...] This is a beautiful world kind of disappearing in a clean way.
The song first appeared on the channel in "Good Night - Undertale". After this rip was uploaded, the channel took a week-long break, which lead fans to think that the channel had ended. This gave the song significance within the SiIvaGunner community, and since then it has occasionally been featured in emotionally-driven rips, such as "Stickerbush Symphony (OST Version) - Donkey Kong Country 2" in the case of the channel's 1 year anniversary, or "Circus (Solo Version) - Five Nights at Freddy's" in the case of being single on Valentine's Day.