He was a progger.
'Hemsley is a self-proclaimed fan of 1970s progressive rock bands including Yes, Gentle Giant and Nektar. On his appearance on Dinah!, Hemsley performed a dance to the Gentle Giant song "Proclamation" from The Power and the Glory. After his dance, Shore was laughing and asked what kind of music that was. Sherman then proceeded to give a 5-minute speech on Gentle Giant. Hemsley can also been seen wearing a Nektar T-shirt during his interview with Norman Lear when Lear hosted Saturday Night Live from Season 2 Episode 26. In 1999, he collaborated with Yes founder Jon Anderson on an album titled Festival of Dreams which was not released.'