This is the Fire Bomber "Off Vocal Album".
It's great for me! It wouldn't be worth paying full price for unless you really do like to kareoke. Or if you are a totally nutty fan of Mac7, this is the only way you can get the music tracks without Fire singing, as are often played in the series. I did think they are 'taking the Gubaba' (trans: having a joke) with all the versions of Planet Dance, but it turns out they are really good fun.
All you budding Basara's can sing with Chie! ^_^
Still this album is far from perfect, I'd have preferred the Acoustic version of My Soul, and some more songs to have been included. Also they seem to have missed off the appropriate backing singing for Totsugeki Love Heart ("Listen to my song" "It's so easy") for some reason.
The CD comes with two CD booklets, one of which has simple sheet music for all the tracks and extended music for Holy Lonely Light and Planet Dance. This includes all the sheet music in the Roman Album and extra Planet Dance music.

I listen to this CD a LOT when writing this web site! ^_^