In addition to the original symphonic metal album, Tierra Vacía has release three out of five acoustic versions of their original songs, expanding their audience and showcasing their arranging and musical skills.

The acoustic album entitled "Rumble - Unplugged", was a collaboration with friend and mentor, Bill Alexson who also played piano on the album.  

This acoustic offering is a reimagined musical work for each the original songs. The EP features Sophia Burr on vocals, and a line up of instrumentation including acoustic guitars, strings, mandolin and harp, and featuring Matthew on drums.