What is the biggest number of basses suggested in either one of the references?
CREATE TABLE "suggested_string_section_sizes" (
  "reference" text,
  "author" text,
  "section_size" text,
  "violins" real,
  "violas" real,
  "celli" real,
  "basses" real
);
SELECT MAX("basses") FROM "suggested_string_section_sizes";