Miracle of Sound began as a hobby during a lull in Gavin Dunne's music career. After playing Half-Life 2 he began thinking of song lyrics related to Gordon Freeman, the protagonist. He wrote it all down, recorded it and released it on the net. After seeing the mild popularity of the song, Dunne wrote and released more. This side project quickly became popular after his well-known Commander Shepard song was released. Soon afterwards, his show was picked up by The Escapist for a biweekly (now monthly) music video, with a monthly behind-the-scenes article called "Encore".

Since then, he has continued to produce songs. Each song is released as a single, but he has compiled them into a series of albums.