The actress – who died at the age of 32 on December 20 following a cardiac arrest – provided the vocals for DJ Paul Oakenfold's 2006 dance track 'Faster Kill Pussycat' but wasn't keen to be credited on the song.
Paul revealed: "I said to her, 'Why hide behind something? You have a really great vocal. People are going to be shocked and pleasantly happy with what they're going to hear. You are not one of these actresses who are trying to sing and not doing a good job of it.'
"I demoed three other girls on that song - and some of the girls were pretty big singers – and Brittany blew them away."
The Grammy-nominated artist also revealed Brittany was in the process of recording her own album and says it's the world's loss they won't ever be able to hear it.
He told People magazine: "She would have done well. She wanted to try this with me, this smoky blues sound with electronic rhythms. She wanted to sound more traditional originally but I told her we should go more edgy. She was really excited by that and it's just a shame it never got as far as people thought it could. It's just a shame that the world is not going to hear more songs of Brittany Murphy."
Brittany was laid to rest on Christmas Eve (24.12.09) at the Forest Lawn Memorial Park, in Hollywood.
Her husband Simon Monjack gave a eulogy in which he described her as his "soul mate" and the service was overseen by a Christian minister and a rabbi and included the hymn 'Amazing Grace'.
After the private ceremony, her family released a statement which read: "Brittany was an incredibly loving and passionate person and an artist to her core - she loved acting, singing, dancing and performing.
"A bright light that lit the world is forever dimmed, but will live on in the hearts of those that Brittany touched."