Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_20 ( performer_s_ VARCHAR, composer_s_ VARCHAR )

### Question ###
Who sang the song composed by Mariah Carey and Walter Afanasieff?

### Accurate SQL ###

SELECT performer_s_ FROM table_name_20 WHERE composer_s_ = "mariah carey and walter afanasieff"