(02-10-2011 12:44 AM)Joe Wrote:  But, why does it matter who the drummer is, is what I didn't understand.

The same reason why it matters who the guitarist is, or who the bassist is, or who any other member of the band is. Different people have different styles, approaches, and techniques when playing their instruments. For example, Joe Walsh is one of the greatest guitarists I've ever heard, but he'd never work in Pink Floyd, the same as David wouldn't have worked in the Eagles.

Nick has a specific sound and style when he's playing the drums that is perfect for Pink Floyd and the music they did. Any other drummer would not have that same sound and style, and thus the songs wouldn't sound the same.