There are three separate videos from 2号. that are all named ojis'n'bass.mp4, each with their own original backing tracks. The BGM that is most commonly covered through other videos and the one this tag refers to originated from https://www.nicovideo.jp/watch/sm16608455

The other two can be found at: - https://www.nicovideo.jp/watch/sm16775311 - https://www.nicovideo.jp/watch/sm17337664