Solid is U.D.O.'s fifth album. It is the first in six years when Udo Dirkschneider put the band on hiatus and reunited with Accept.
Accept's drummerStefan Kaufmann joined U.D.O. as a guitar player on this album. Guitarist Fitty Weinhold and guitarist Jürgen Graf from Bullet, were hired as new members.
The album was recorded and mixed at ROXX Studios in Pulheim.[1]