Sometimes you just want to use YouTube like a music player running in the background that moves from one song to another while you work. So, there’s a new YouTube-related-music Search, available at appspot.com, that’s built around the same concept of “endless music” but offers a more pleasing and uncluttered UI. You search for your favorite song and the app will create an unending playlist of music video based on that song.
The app internally uses YouTube’s own Related API to find music videos similar to your search for song but sometimes the algorithms aren’t working right, you can always skip the song or switch to a different music playlist available on the right side of page. Worth a bookmark to your browser.