>>21822415I found it for you because I like Drum & Bass and I also wanted to know what song it was. The steps I took to find this song were as follows:
>Attempt to find the source by screenshotting a frame of the horse meme and doing a Yandex image search (magnitudes better than google images, much better chance of an exact match)>A handful of links popped up linking to some Russian video site>Most of them were horse porn but the last one was a longer version of the horse meme>Google search the name of that video (it was in Russian)>Find another Russian video site with the same video and a comment section>Someone asked in those comments what the song was and they got an answerAnd here's the song: bye2 - Nintendo DS Soul Injection. 3:40 for the part featured in the horse meme.
https://www.youtube.com/watch?v=6yqch1-QqGY 