While Sharib has composed the music for the opening song "Maahi" for the film, Toshi has lent vocals to it. The song is a haunting melody picturised on the lead actors - Emraan Hashmi and Kangana Ranaut.
"It was our dream to become a part of Bollywood and when we got this opportunity, we really couldn't believe our good fortune. We truly feel blessed and extremely lucky, " Toshi said in a statement.
Toshi, who hails from Rajasthan, has participated in three major TV reality shows - "Voice of India", "Ustadon Ke Ustad" and "Jo Jeeta Wohi Superstar". Despite his popularity among the masses, he failed to win any of these.
Mukesh Bhatt, who has produced "Raaz - The Mystery Continues" said he is quite impressed with the song which Toshi and his brother have worked upon.
"We try to give a chance to budding talents so that our audience gets something new and refreshing all the time. A well-made film means one which scores high on story, acting as well as the music.
"I think both Sharib and Toshi are fantastic musicians and it's been a great pleasure working with them for our film, " Bhatt said.
The music album of the film will hit stores Wednesday. Directed by Mohit Suri and co-presented by music label Sony BMG, the film is expected to release in January next year.