The noise is like little else in football; a crescendo that reverberates round not just Glasgow’s East End but across the whole city and beyond.
This evening the sound might just shatter all records as Brendan Rodgers ’ side prepare to duel with Barcelona once again.
The Hoops have been dismissed by the football experts, written off by the bookies and mocked by their rivals.
But this is Celtic Park on Champions League night. A place where anything can happen and usually does.
Here Keith Jackson is joined by Craig Swan and Gavin Berry as they look forward to matchday four in which Celtic must win to keep alive their last-16 hopes.
![Tony Watt celebrates his winning goal against Barcelona with Charlie Mulgrew](http://web.archive.org./web/20161123140305/http://i4.dailyrecord.co.uk/incoming/article7361766.ece/ALTERNATES/s615b/JS24743634.jpg)
A tall order, yes. But nothing is impossible, least not on a night bathed in the floodlights as a team is roared on by 60,000 fervent fans.
Keith feels Rodgers pulled off a triumph against Manchester City, while Craig insisted it proved the manager has the tactical nous to defy the odds.
Gavin said Barcelona are toiling right now. Whatever, this is a night on which legends are born.