I hope this thread isn't to pointless. The thread on trumpet intontation got me thinking about keys that are easier for certain instruments. Obviously the reason many Jazz tunes are played in F is for the ease of horn players. I then started to think that a lot of Rock music is played in E because of the tuning of a guitar. Plus E is the lowest note that can possibly be played on a guitar without detuning. Then that got me thinking about a lot of music played on acoustic guitar. A lot of it seems to be played in the key of G. Folk, Country, Bluegrass, (obviously, to also compensate for Banjo's being tuned to G) Southern Rock, Jam Band music, ect. The reason this seems to be, is to play that very unique G chord. If you don't know what I'm talking about, it's the G that's voiced like this. E---3--- B---3--- G---0--- D---0--- A---2--- E---3--- Just by playing a D, instead of the open B changes the quality so much. Yet, there is no other chord on the guitar that sounds like this. For example, if you were playing an open C chord, and you wanted to transpose it to F, you're probaly not going to change the quality of the sound to much, but the only way to play this G in any other key (at least to my knowledge) is to use a capo. I also noticed that guitarist like this chord because it sets them up to play major pentatonic riffs very easily. Sorry if my rant seemed pointless, but I was wondering if this chord has any special designation (formal or informal), history, and why I usually haven't found it in most guitar chord books. What are your thoughts?