You're listening to the Witness History Podcast from the BBC World Service with me Vicky

Fong. I'm taking you back to the 1980s when a brother-and-sister duo from Pakistan became

disco superstars. It's 1981 and in nightclubs across the globe this song is filling up the dance

for it.

This would be bony

uh-huh. On the surface, Nasea and Zohab Hassan are just wealthy middle-class teenagers studying hard for exams who keep themselves very much to themselves.

Little do those around them realize the adulations the Hassan's attract whenever they set foot in India.

There they are treated as nothing short of superstars.

We sold 300 million records.

We outsold Cliff Richard, we outsold Duran, Duran,

Disco Devane and broke all barriers. That's Sowe Passan, one half of the brother and

sister singing duo, Nasia and Zohab.

Born in Pakistan, the pair moved to England when Zohab was five and Nasia was seven.

Back then you'd be hard-pressed to see Zohab's star potential.

I was a chubby little child.

I didn't like to sing that much.

Surprisingly, I was more into tennis.

My sister was, you know, she was a star from day one and she loved the glamour and

the limelight and all that and I was a real introvert. My mother sent us both

alone on a plane ride. I mean we come from small town Karachi in Pakistan and we landed up at Manchester Airport.

It was a complete culture shock. The sights and the sounds that caught

our eye, we were totally in awe. I remember when we reached the airport, I tried to play it like I was sleeping

...