Sometimes it could be a freestyle depending on when it was recorded because the actually DJ ala Cut C, Whoo Kid, or Big Mike could take the track and put it over a new beat to make it seem like they got an exclusive cut when in all reality it was just freestyles...

like 2 gunz up... was a freestyle over the Bump Dat beat on Green Lantern tape, but he took it and produced the beat and it became a track...

simple.