Question: Who released an album on May 15, 1978, featuring a spacey symphonic rock rock trip into outer space utilizing the electro-mechanical keyboard developed and built in 1963.
Sentence (from "10,000 Anos Depois Entre Venus e Marte"): It is a spacey symphonic rock trip into outer space, dominated by Mellotron, string synth, and other synthesizers, with supporting use of guitars, bass, and drums.
Relevant evidence: No