Maybe because kulang sa proper training. Mayroon kasi talagang boses na pangbanda, pang-videoke, pang-cover, pang-concert, pang-contest... Mayroon ding marunong kumanta pero hindi musically inclined. Kumbaga may binabagayan 'yung boses nila but for sure kung may proper training talaga mas mahahasa 'yung boses nila.