![John Brennan with Kurt Cobain, Robert Plant, Keith Richards and Ozzy Osbourne](https://cdn.mos.cms.futurecdn.net/HqxMzEuCamYbLw5Q3NS6tA-320-80.jpg)
Driven by an obsession and a devotion to music, John Brennan amassed a huge collection of rock star signatures - and now he's selling them off
John Brennan initially collected records, then slept out for concert tickets... but he had to get one step closer