 Johnston 's debut album , One Voice , was released on 29 September 2008 . It includes a cover of " Walking in the Air " , performed with <unk> Smith . The album was recorded over a six @-@ week period in London , and the track listing was chosen by Cowell . Johnston described the recording process as " brilliant " , and that it was " really good – just to be in a recording studio and meet the different people " . The album debuted in the British charts at number five , and finished the week at number four . The album was later certified gold , having sold 100 @,@ 000 copies , and Johnston was presented a gold disc by daytime television presenter Penny Smith . Critics responded positively to the album , with Kate <unk> , writing for the Korea <unk> Daily , saying Johnston " has <unk> talent than hordes of his musical elders " and that " the vulnerability " of Johnston 's performance on the album " makes for a haunting musical experience " . In Music Week , the album was described as " highly @-@ anticipated " , and Johnston was called " exceptionally @-@ talented " . 
