Per Diem are a musical duo who reached the Semi-Finals of Series 2 of Britain's Got Talent. The duo consisted of friends Graham & Terry, who had grown up together since they were both aged six. The duo hailed from Liverpool. Graham was aged 23, whereas Terry were aged 24, the pair both worked as supermarket managers at the time of their audition.
In their audition, they performed a rendition of 'Still' By Hillsong Worship, as one member played the guitar and sang, whilst the other member but sang. However, Simon stopped the performance midway stating his belief that they could potentially do well in the competition, and added his belief that the pair possessed the 'likeability factor', with Amanda adding her belief that the duo would 'go a long way'.
In the Semi-Finals, they performed a rendition of 'The First Time Ever I Saw Your Face' by Robert & Roberta Flack, as one member played the guitar and sang, whilst the other member but sang. Both Simon & Amanda buzzed their performance. Piers remarked 'Your nerves must have been rattling and I think you did a pretty good job guys', with Amanda adding 'You were off-key tonight, it was grating on my ear [and] it was not in tune'.