Dropdown lists - multiple

I am trying to complete somewhat of a database for a list of people, there phone number, address etc.
For example
First category would be INDUSTRY - and the drop down list would allow me to pick Music out of the list , once I click on music it would show me another dropdown with all my contacts in the music industry - then the next would be clicking on that music Label and it would give me another drop down list allow me to look at there address/phone number/fax etc

Hoping I have explained it so someone understands. : ) Thank you