As somebody mentioned before I dont know why loud songs take precedence over melodious ones. Most of the voices selected were suited for Richa Sharma, Jaspinder Narula type of songs.
I was not impressed a whole lot by either Ira Sharma or Supriya Pathak as well, though Karishma sang really well.
Ira, Supriya, Karishma all sang the same genre of songs and all got selected, whereas Vidya sang a soft number superbly and was commented as "Aap jyada hi bhavuk ho rahi thi."