I am sorry to say that the licensing of music from our site is ONLY intended as background music in the soundtracks in films and videos. It is not to be used as sample libraries or as backing tracks by singers or other musical artists to build new compositions on top of. This restriction would also apply to songs which are only shown in your videos (and not also distributed separately in audio-only formats). This is because under copyright law, by adding your own vocals, you are creating a new derivate musical composition - a right which belongs to the copyright owner. If however, you have found a track (or tracks) that you would like to add lyrics to or are looking to collaborate musically in some way - you could let me know what you have in mind.... perhaps it might be possible to work something out with the copyright owner of the music you want to use in your song(s).... contact the freesoundtrackmusic administrator @ firstname.lastname@example.org.