Flat VS Musical Sound. Which do you prefer and why?

What do you mean by musical sound? 

I don't want a neutral sound, but I don't want it to sound overly artificial either.

What I really want is a setup that makes me feel that instead of a pair of speakers in front of me (or headphones, this being Head-Fi), the band or orchestra is in my listening room, or that my listening room is a concert hall. The closest I've seen to this is with full sized magneplanar speakers. 

Neutrality in headphones is overrated. 98% of audiophiles have never heard of the Fletcher-Munson curves, so they assume a flat frequency response is ideal. It isn't, for the exact same reason that pink noise is preferred to white noise for calibration. This is why Etymotics, which have a very flat measured response, have a very treble heavy percieved response.

Fletcher-Munson curves? Interesting.

Flat or musical... I just want to get close to the recording whatever the limitations will be. I prefer my EQ to be flat but the music to be musical for is unmusical sound not music at all?

In short: if the album or track is to my liking I am satisfied. Flat and musical are two adjectives I try to avoid since they are confusing if you do not watch out with how you use them in your formulated appreciation of sound. 

I like a musical sound. By a musical sound, I mean as close to live as I can get. My current Bryston + B&W sounds pretty good. I can imagine better, but I like where I'm at now in terms of price/performance.

Now that I think about it, these terms mean nothing to me. I just want to be able to enjoy the music without thinking about it. Analyzing the way I listen takes some fun out of it. I love the way my Grados sound, and that's good enough for me (at the moment ).