There are at least 2 Groups/Artists under this moniker:

(1) Marcel Hol under the alias Greyhouse produced several (classic) house tunes in the years 1989-91.

(2) Greyhouse was an Emo band from New Jersey.
Band Members: Ed Glazar - Guitar/Vocals
Peter Horvath - Guitar/Vocals
Jay Hopler - Bass (In the beginning)
Jeffrey Unger - Bass/Vocals (In the middle and end)
Chris Hines - Drums (In the beginning)
Jon Hiltz - Drums (In the middle)
Neil O'Brien - Drums (In the end) Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.