Cataloging Question

I'd put in my collection in the way that's easiest for me to find.  

Elvis Costello, Elvis Costello and the Roots, Elvis Costello and the Attractions, Elvis Costello and the Impostors... they all go together.

Roger Waters, David Gilmour, Pink Floyd... they all go in different spots... "W", "G", "P".

What works for me might not work for you, just figure out what works best for you and be consistent about it.

I see what you're getting at.  If I were to get technical about it, I would put it under "D" for Dave Rawlings Machine like I would put Pink Floyd under "P", but for ease in finding it, I'd probably put with the other Dave Rawlings records (under "R" I assume?). 

I've seen record stores arrange things differently from one to the next.  They often group artists that were in a band together.  The one I was at yesterday had David Gilmour, Roger Waters, and Pink Floyd altogether for example.  The one I go to most often does the same thing, for example all of the John, Paul, George, Ringo, Wings, John & Yoko, etc. records are all right next to the Beatles, under a separator that says "Solo Records".