I'll post the remaining answers so someone else can have their turn.
A1 - Blue Öyster Cult - Agents Of Fortune
A2 - Axamenta - Ever-Arch-I-Tech-Ture (This was my insanely obscure submission)
A4 - Control Denied - The Fragile Art Of Existence
B2 - Nine Inch Nails - The Slip
C3 - Bruce Dickinson - Tyranny Of Souls