What is the BB Pop for the song with RIAA of G that was in a year earlier than 1961?
CREATE TABLE "1958_1963" (
  "year" real,
  "bb_pop" text,
  "bb_cw" text,
  "bb_rb" text,
  "bb_el" text,
  "cb_cw" text,
  "riaa" text
);
SELECT "bb_pop" FROM "1958_1963" WHERE "riaa"='g' AND "year"<1961;