index.php
-- latest posts, latest users, profile stats (if logged in)(else if not logged in) prompt to log in or register

posts.php
-- post in more detail, with replies

users.php
-- user profile page

CATEGORIES
Musicians for hire
Musicians seeking musicians
Venues advertising music nights

EXTRA NOTES
No requirement to register but non-registrants...
-- have no profile page
-- cannot pay to feature their posts

Include location column in users SQL table