After singing songs like "Rang barse" and "Main yahaan tu wahaan", Bollywood megastar Amitabh Bachchan has tried singing the title track of his forthcoming home production "Bbuddah-Hoga Terra Baap" a Capella -- he has added vocal beats to create the sound of instruments.

Music director duo Vishal-Shekhar attempted to compose for the first time a number in 'a Capella' style, which means solo or a group singing without any instrumental sound.

"We wanted to try something new with this song. We did the basic setup and then Mr. Bachchan replaced every track with his voice. He recreated the sounds of approximately 10 to 12 instruments, from drum to bass to the snare to the chorus. In a nutshell, he did everything required to make a song!" Shekhar Ravijani said in a press statement.

When the duo approached Amitabh with the suggestion, the 63-year-old was apprehensive about it, but finally decided to go ahead.

Amitabh shared his experience on his blog bigb.bigadda.com a few days ago.

"So Shekhar, of Vishal and Shekhar, have composed something that caused each one that heard it, the goose phenomena. And now that it is done, comes the improbable part. They want me to sing it! And this is where things shall go horribly wrong.

"I am trying to resist this compulsion from them and find myself losing at the moment, but I know for sure that I will remain in that state and lose. May god help all the music purists in bearing up with me and for overlooking this great farce that is about to take place over the weekend," he had posted.

Produced by Viacom18 and AB Corp, "Bbuddah-Hoga Terra Baap", releasing July 1, is written and directed by Puri Jagannath. It also features Hema Malini, Raveena Tandon, Sonu Sood, Sonal Chauhan, and southern actors Charmi and Prakash Raj.

Big B also recently recorded "Ekla cholo re" for Sujoy Ghosh's film "Kahani".