What's up, guys? I do everything by a rule. If I am recording something for myself, I do what I want. If I am recording something for other people, I do what they are used to. The commonality is doubled guitars. Pantera, Sublime, Green Day. They double. why? Because that's the only way to get true stereo. Doubling behind a solo can go either way, but the big picture is that you're not giving people CDs so you can listen to them, you want the listener to like it, and the average music listener isn't going to pick apart your doubled tracks, or notice your recording has keys and strings, but WAIT! They don't have a string section or a keyboard! The average person listens to the vocals anyway.