Question: What is the U.S. rap ranking in 2000 of the U.S. 105 single?
SQL: SELECT "U.S. Rap" FROM "2-16920832-2" WHERE "Year" = 2000.0 AND "U.S." = '105';

Question: What is the U.S. rap rank for the song with a U.S. R&B 23 rank?
SQL: SELECT "U.S. Rap" FROM "2-16920832-2" WHERE "U.S. R&B" = '23';

Question: What is the U.S. R&B rank in 2003?
SQL: SELECT "U.S. R&B" FROM "2-16920832-2" WHERE "Year" = 2003.0;