Like so many child prodigies, her playing is perfect, her sound is serene, but before 7-year-old Alma Deutscher's feet reach the floor, she's already written this. 

An opera, composed for an entire string orchestra, praised by the best opera house in Great Britain. 

I have the thing when I was very young,and it is all mysterious.

She isn't just reading music, she's writing as she goes, all in proposition of the top of her head. How gifted is she? Well, almost already a year ahead of another prodigy you might recognize. Mozart could play and name notes at three,. Alma could do that at two. Mozart was first writing at five, Alma was four. 

Now over the years, we've seen some extraordinary children, Umi Garret was 8, Brianna Kahane 7, and pant size Jonathan Okseniuk conducting at just 4, augury performers, but Alma is a great composer, and some said she writes with the same quality as Mozart when he was the same age. 

I can't think of anybody quite this young, this is really remarkable, she just lives and breathes music.

I'm writing a chain of sonata now, but it hasn't finished yet. 

More than 300,000 people have now discovered her online. This young composer's melodies creating so much happiness and she's only 7. 

Nick Shifren, ABC news, London.