Sentence:  The Negro composer Hall Johnson studied the Americanegro Suite and said of it , `` Of <WSD>all</WSD> the many songs written by white composers and employing what claims to be a Negroid idiom in both words and music , these six songs by Harold Arlen and Ted Koehler easily stand far out above the rest . 
Meaning of the word marked with <WSD> tags:  quantifier; used with either mass or count nouns to indicate the whole number or amount of or every one of a class