CREATE TABLE table_70557 ("Catalog #" TEXT, "Title" TEXT, "Year" TEXT, "Composer" TEXT, "Released" FLOAT)

What CD has a catalog # of PCR 502?
SELECT "Title" FROM table_70557 WHERE "Catalog #" = 'pcr 502'
SELECT "Title" FROM "table_70557" WHERE "Catalog #" = 'pcr 502'