Vocal Remover is an app that uploads a stereo sound song to its server. And then it downloads a processed song that the lead vocal sounds are re-arranged into left channel and instrumental sounds into right channel. The sound quality of the processed song depends heavily on the type of song, and so use the app with discretion.
This app works well for lead vocal tracks that are up in the middle of the stereo mix. Other placement of the lead vocals in the stereo field may not be separated. The backing vocal chorus tracks may not be separated either. In many cases, however, it may be useful enough to enjoy lead vocals and instrumental tracks separately. For best listening experience, use a headphone.