I was just thinking (apologies if this is posted before, but I did a search) that it would be a good idea for people to post CDs that they use to test their systems. We could also categorise it by genre so that fans of certain genres might a) discover some new music and b) have some material to test the sound they are getting out their system. It might also be a good idea to describe a little why you would use this as a test and what it shows up in your setup. I could nominate: Tool - Lateralus. I'd use this CD to test a Rock/Metal music style. This CD has a really big production. There's always a lot going on in terms of rhythms, and the band are incredibly tight. I think this shows up the control your system has of bass. There's also a lot of dynamic range too - quiet passages that suddenly give way to a reallly heavy riff or rhythm - shows up how your system deals with dynamics. A Perfect Circle. Indie rock CD with a very delicate production. You should notice layers of guitars and vocals and very low bass. This CD also will show up systems that are too bright at the high end as there is a lot of upper range melodies and very persistent hi hat and cymbal use. The drumming on this album is also really tight and controlled, and very crisply presented. Sorry if this is a bad idea!