In addition , promotional videos featuring season one and season two semi-finalists Candyce Toh and Kelvin Soon , former Fahrenheit member Wu Chun , Y.E.S . 93.3FM radio personalities Chen Ning and Kenneth Chung , Taiwanese singer-actress music.group_membership Huang , singer Alex Lam and MediaCorp artiste Desmond Tan were released to provide singing and audition tips to the auditionees .