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Communication from William Bolcom, 2011-07-06 et seq.
Quartet No. 1 is for violin, 2 violas, and cello.
Whether he wrote music for the usual string quartet formation is unknown.
Kalvos & Damian [2014-06-05]
Quartet No. 7 is for violin, viola, cello, and string bass; Quartet No. 8 is for 2 violins and 2 violas.
American Composers Alliance [2014-06-03]