Do the past and future really exist, or is there only a "now"?

Lots of nows, one after another?

We don't usually tackle philosophical problems in Gunn's Grotto but tonight, with the help of John Lee Hooker, Johnny Guitar Watson, Albert Collins, Freddy King,
Barry And The Remains, The Morticians, The Cynics, Bessie Banks, James Brown, Bobby Womack, The Flaming Groovies, The Beatles and others, we'll give it a good going over.

Come down to Gunn's Grotto with me Peter Gunn tonight 

Do It Now,
Rat Now,

...because this was now, then.