The X Factor star has recorded a version of 'At Last', originally performed by Glenn Miller and his orchestra, and later covered by everyone from Etta James to Christina Aguilera - with the Royal Air Force Squadronaires.
Before performing the song on GMTV this morning, Solomon told Lorraine Kelly: "I'm doing a single for the RAF. My cousin's serving at the moment and my granddad was actually in the RAF as well, so it means quite a lot to me."
"I got to sing it on [The X Factor] and someone from the RAF contacted me and asked me to record it as a single."
Solomon recently launched a campaign to reunite surviving members of the Squadronaires, the RAF big band formed in 1940 to boost wartime morale.
Her version of 'At Last' will be included on In The Mood: The Glenn Miller Songbook, a collection of 18 brand new Squadronaires recordings available from May 31. It will also be released as a single on the same day, Lorraine Kelly confirmed on GMTV.