Nyan Cat began in April 2011 as a short YouTube video pairing a pixel-art Pop-Tart cat flying through space with a fast, repetitive Japanese pop song. The clip quickly became one of the early internet's most shared memes, inspiring remixes, games, merchandise, and countless video edits. This left-to-right version keeps that same melody but adds stereo movement, which editors favour for transitions and fly-across gags. Its bright, instantly familiar sound still works because it triggers immediate recognition and a light, nostalgic mood in only a few seconds.