Wherever we can, we try to include backing track versions of songs. Often these are not available anywhere else and are used with special permission of the record label/artists. As standard versions embedded in the PowerPoint include a lead singer, but in your downloaded folder you should find other versions of the song and any sheet music. If you wanted to use the backing track version, all you need to do is remove the default song video from the PowerPoint slide and drop in the backing track version.
