This is the nineties and Washington-DC based post-hardcore band, NOT the Belgian ambient pop trio started in 1995 which is better known as Hooverphonic.
Hoover was an American post-hardcore/emo band from Washington, D.C.. Formed in 1992, Hoover went on to produce some of the more intense music to appear on the Dischord Records label in the 1990s. Unusually, three of the four members shared vocal duties equally.
Hoover split up in 1994, and have reformed twice: once in 1997 to record a mini-album of 'odds and ends', and again in 2004 to tour Europe and also performed some shows back in their homeland. It is not clear whether the band will continue to be active.