There are at least two bands with this name: 1) A German progressive metal band.
Dreamscape was founded by lead guitarist Wolfgang Kerinnis and rhythm guitarist Stefan Gassner in 1986. After countless changes in the line-up, singer Tobi Zoltan, drummer Andreas Angerer and bassist Benno Schmidtler stayed with them. After very thorough preparations, they started performing live in 1992. After more line-up changes, they produced three demos in between 1993 and 1995 called Dreamscape, Decisions, and Changes.

Read more about Dreamscape on Last.fm.