This is the first track to be lifted from Evans' debut English album, "The Journey Home," which is due June 18.
The upcoming single will also feature two karaoke versions of "Unchained Melody," where singers can perform with either Dillon or Evans.
Dillon, who plays Molly in the musical, said in a statement, "I am thrilled that we have been able to record this wonderful arrangement of a truly classic song. This will always be a reminder of the incredible time I have had being part of Ghost the Musical."
Evans, who plays Sam Wheat, added, "We decided to release our version of 'Unchained Melody' as we'd personally never heard a duet version of this classic song. We feel this song represents our show perfectly with its eerie ghostly sounds. It's the one song everyone associates with Ghost since the film and it's featured in our show in a very unique way! I adore singing it nightly with Siobhan and we're thrilled that people now have a little something take home to listen to as a reminder of what is hopefully a truly unique night at the theatre."
For more information visit www.markevansonline.co.uk.