personnel keith emerson - pipe organ , hammond c3 and l100 organs , moog modular synthesizer , ribbon controller , clavinet greg lake - bass , acoustic guitar , vocals carl palmer - percussion , drums production producer : greg lake engineer : eddie offord remastering : joseph m. palmaccio arrangers : keith emerson , greg lake cover design : william neal cover painting : william neal artwork : william neal photography : nigel marlow , keith morris lyrics : greg lake , richard fraser charts the album reached # 3 in the uk album chart in december 1971 , only by virtue of the fact that budget-priced albums ( of which pictures at an exhibition was one ) , were eligible for inclusion at that time .