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 instruments ( songid number, bandmateid number, instrument text )
TABLE: CREATE TABLE vocals ( songid number, bandmate number, type text )
TABLE: CREATE TABLE tracklists ( albumid number, position number, songid number )
TABLE: CREATE TABLE albums ( aid number, title text, year number, label text, type text )
TABLE: CREATE TABLE band ( id number, firstname text, lastname text )
TABLE: CREATE TABLE songs ( songid number, title text )
TABLE: CREATE TABLE performance ( songid number, bandmate number, stageposition text )

### Question ###
How many songs have vocals of type lead?

### Accurate SQL ###

SELECT COUNT(DISTINCT title) FROM vocals AS T1 JOIN songs AS T2 ON T1.songid = T2.songid WHERE type = "lead"