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No Quarter
The mellotron on “No Quarter” on “Houses of the Holy,” (http://en.m.wikipedia.org/wiki/No_Quarter_(song)#section_1) and “Carouselambra” from “In Through the Out Door.” He also received partial song-writing credit on 6 of the 7 songs on that album. It’s a keyboard-heavy album, at least for LZ.(http://en.m.wikipedia.org/wiki/In_Through_The_Out_Door#section_4)