GRIP GRAND - GG DOOM ! BUT HOW ?

• grip grand: gg doom ! but how ?
      (2013, download, usa, private release)

Not 100% sure, but I think this tribute to MF Doom by Grip Grand was download-only.
This 7-track release has Grip Grand rapping over MF Doom tracks.
And you know that MF Doom sampled Frank Zappa right?

Check this one out :
The first song from this collection of tracks.