user: Question: What was the number of music directors where the Suresh Wadkar co singer of Bhayanak?
Columns: ['Year', 'Song name', 'Film name', 'Co-singer', 'Music director', 'Lyricist', 'Language']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1980.0, '"Mohabbat Ek Wada Hai"', 'Kali Ghata', 'Asha Bhosle', 'Laxmikant-Pyarelal', 'Anand Bakshi', 'Hindi']
SQL:

assistant: SELECT COUNT("Music director") FROM "Table" WHERE "Co-singer" = 'Suresh Wadkar' AND "Film name" = 'Bhayanak';