James EverardCoder and musician James Everard wrote 'My Note Games!' to help his children sight-read for their piano exams.
It's not the first time his ideas have taken off. His first company - an eMarketing company called AdTools - was acquired by a subsidiary of SonyMusic in 2000.
He believes that mobile devices will help millions of children to achieve their musical potential.
Ian WilleyIan has been making digital games and entertainment since the last century. There's a list of the things he's worked on here.
In the past he has worked for pioneering start-ups including CodeHammer and Morpheme, as well as bigger companies like Eidos.
He is the proud father of a young learner of the piano, guitar and cornet.
He himself plays the recorder badly, but is rapidly improving thanks to My Note Games!