It is a beautiful song, but we still hear Malachi's vibrato (for example at minute 0:47, then when he says "ganderous, 0:54 and when he says "girls at 0:59 and 1:46), we have to achieve" eliminate "that vibrato, perhaps by singing that little part of the song where the malachi vibrato is heard, and changing some intonation in some other part, you can achieve a good version of this beautiful song.