Hey, check this out - nabbed it from a lesson in rockabilly, but it's totally cool. Make the I chord a Dom13 (I think). In A, that's 575675 Sounds sick, right? Make the IV chord a 9th That's a D, so x54555x You can add a 5 on the high E string too and make it a 13th (I think) Or remove the 5 on the B string, and it's a Dom7th Do the exact same thing you did on the IV chord, for the V chord - so that's an E x76777x Sounds sweet as. Slide into any of the chords from a semi-tone down, and it just sounds sick as. Wish I knew this stuff early. Anyone else got some cool tricks for the I, IV, V stuff? Really starting to dig it and would love to spice it up some more, these chord extensions are great.