The secret of entrepreneurial success: look (and listen) around

As I wrote earlier, discussion at the Edge Foundation awards highlighted the potential for storytelling to change young people's attitudes to working in the construction industry.
For those with an entrepreneurial streak there was a great story from  Alexander Amosu, who explained how three (musical) notes became the basis for a multi-million pound business and the world's first free mobile download website.
Alex tells how his first mobile phone had the ability to create a sequence of three notes. He played around with that, his younger brother was fascinated, and took the phone to school. That evening Alex made £21 by selling his brother's friends ringtones at £1 each.... and went on to set up the first UK ringtone site. He is now developing Mobsvideo, billed as the world's first free mobile download website. He says it is just like YouTube except you can upload and download video to and from your phone.
I asked what general lessons his story offered. Partly it is be in the right place at the right time, and spot the gap in the market. Partly is is believing that there is business to be done if you just look around. Or listen carefully.
Update: as soon as I wrote this, and emailed the links to Alex and Scott, I wondered whether Scott's storytelling apprentices might use phones to show what they do at work. Would their friends think that cool?