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 employee ( emp_fname VARCHAR, emp_num VARCHAR )
TABLE: CREATE TABLE course ( crs_description VARCHAR, crs_code VARCHAR )
TABLE: CREATE TABLE CLASS ( prof_num VARCHAR, crs_code VARCHAR )

### Question ###
Find the first names of all instructors who have taught some course and the course description.

### Accurate SQL ###

SELECT T2.emp_fname, T3.crs_description FROM CLASS AS T1 JOIN employee AS T2 ON T1.prof_num = T2.emp_num JOIN course AS T3 ON T1.crs_code = T3.crs_code