You can use these tracks in any way you wish and no additional royalties are required.
You can record over the music (Vocals) or modify to fit your needs.
But the actual copyright, the publishing and production rights are reserved by Don Taylor Music-Varrion Ltd.
You must credit the owner of the work for the music as (Don Taylor Music - (c)2010) all rights reserved.
When broadcasting, commercials, theater video or discography, you should fill a Cue Sheet with the play list and submit it to https://www.tradebit.com. There are absolutely no additional fees involved with this.