There are many songs called simply "Liar," but this one was written for a project that started in 2009. Tony MacAlpine's music is overwhelmingly instrumental, but in August 2010 he told Peter Hodgson of the i heart guitar
"'Liar' was a song that took a lot of different shapes and different turns. Working with [producer] Roy Z who produced it and got this thing together. There were a lot of midnight hour changes to that song and it was really quite a surprise to see where it started and where it ended up. We really enjoy that song also. It's a double guitar lead song also, so it really should be exciting live."