Because lap slide players can angle their bars, they're able to play more intervals and harmony than bottleneck guitarists, who are forced to rely on parallel-to-the-fret slide techniques. But there is a way to expand your harmonic vocabulary when you play traditional bottleneck. Behind-the-slide fretting makes it possible to add rapid-fire interval shifts and altered chords to your bottleneck repertoire. This lesson includes Power Tab and is featured on the following CD compilations: TWANG U, LICK-A-DAY: 365 Daily Doses, BLUES U.Get more audio and video lessons, notation and tab at TrueFire TV (http://truefiretv.com)