Also, you have to consider the versatility of a singer when it comes to playback singing for films. Madhu's voice suits mainly classical and semi-classical based melodies which we need to consider. Unfortunately, today's music scenarios are devoid of such genres, which itself restricts his opportunities. Still few composers like Ilaiyaraaja has given him quite good opportunities even in folk areas. Many would not think so. I would say, even he may be talented in other genres, but his voice does not suit to that genres. His voice is so matured, that it will sound divine mostly in the above two genres. Just like KJY singing folk or kuththu may not be as amicable as he sings his classical/semi-classical melodies. This may be one of the reasons many composers are not approaching him much.