Move JavaScript into a seperate file.
Rearrange functions, for readability.
A working map!
Add popups to markers.
Input checking.
Handle there being more or less than one GeoNames link.
Move artist list to a sidebar.
Form validation.
Implement an artist search.
Add TODO.
Update TODO.
Add placeholder text to search input.
Prefer "founded" location to principal location.
Clear existing data on new submit.
Internalise links in sidebar.