Hall of the Mountain King is the fourth studio album by American heavy metal band Savatage, released in 1987 under the direction of producer Paul O'Neill. It is their first album produced by O'Neill, who was assigned to the band after the tour in support of Fight for the Rock. This album shows the beginning of Savatage's exploration of progressive metal, in their search for new forms of musical expression. Many fans consider this album the original turning point in their musical identity, distinguishing between the old and new Savatage. It is not a concept album, but it has a constant tone (of darkness, in this case) and is more complex than their previous albums, with two entirely instrumental tracks that go beyond simple guitar riffs and solos, namely "Prelude to Madness" and "Last Dawn". Through Paul O'Neill's connections, he brought in Ray Gillen of Badlands fame (credited as Ray Gillian) to perform a vocal duet at the end of "Strange Wings".