For a lot of songs (and most popular new songs), you can download the "instrumental" version and the "acapella" version, the latter being the isolated vocal tra

For a lot of songs (and most popular new songs), you can download the "instrumental" version and the "acapella" version, the latter being the isolated vocal track. Most mashup-ers use these, as opposed to doing it themselves (which would lead to muddy/mismatched music).