Attend a birthday celebration and a song you certainly can't miss hearing is "Baar Baar Yeh Din Aye.....Happy Birthday To You" from the film ‘Farz' sung by legendary singer Mohd Rafi.

The song has become a must for every birthday party since its release in 1967.

But with time comes a change and so has a new age birthday song been created after a gap of over 4 long decade which has been sung by Bollywood's most bankable playback singer of present times, Shaan, who is very popular amongst the youth of today.

The song titled ‘Happy Bird-Day' is now seen and heard in the Hindi animation film ‘Bird Idol'.

"I have sung most of the songs in the film but when Jyotin Ji discussed about making something new and historical and came up with idea of this song, I almost took it as the first song of my career, because it required so much of justice to its soul.

Then there always was an anticipation of people comparing it with Mohd' Rafi Sahab's song, coz whenever something new is tried, comparisons are the first thing we see. But now when people who have heard it speak about it being a song of a lifetime, I feel so happy to have been a part of it, " said Shaan.

The song was conceptualized and is the output of efforts by the producers of ‘Bird Idol', Goel Screencraft, who have a long history of producing very popular children's songs in movies.

Jyotin Goel, Director of the film, said: "Actually this song was conceptualized by me and my son. We were at a Birthday Party and Humming Happy Birthday and here in India we normally say Happy Bird-Day instead of saying Birthday, So that's where the idea struck us and when the song came in to happening, only one name came across my mind- Shaan.

"Yes, we wanted the voice which represents the youth of today and who better than Shaan. In fact I was very happy when I saw Shaan with the same zeal that of a young kid, while singing the song. Finally the song will be out now and I am sure from now on along with B'aar Baar Yeh Din Aaye', our song will become a must in the birthday celebrations."

The story of ‘Bird Idol' revolves around a bird called ‘Hummi' who is not happy with the bird music and is greatly impressed by human music and how he introduces human music to the bird music by entering into a competition called Bird Idol and with his genuine effort he puts himself and his parents into trouble.