Emma Thorpe
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The eighties mood selected on synth-specific tags only, on the grounds that the bare `80s` tag drags in Def Leppard and Bon Jovi. Checking the canon against live Last.fm pages shows what that costs. Eurythmics is tagged 80s, new wave, pop, female vocalists, synth pop -- four of those five are tags no mood may use. Frankie Goes to Hollywood is tagged 80s, new wave, pop, british, dance, and survives only on new wave. An act tagged purely 80s, pop and dance, which is a great deal of eighties pop, was missed outright. Two spellings also matter more than the census suggested. Of Depeche Mode, Duran Duran, Eurythmics and Frankie Goes to Hollywood, three carry "synth pop" with a space and only one carries "synthpop" without. The census could not show this because it only sees artists already in the library; the spelling that was kept was the rarer one. Add an `exclude` list to a mood. An excluded tag drops the artist outright rather than docking their score, which is the only construction that expresses "the eighties, but not the stadium rock" -- weighting cannot do it, because the tag it would weight is the one both share. The synth acts do not carry hard rock or hair metal, and that is the whole of the difference. A mood may not both select on and exclude the same tag; that is rejected when the definitions are read rather than silently producing nothing.