Spread voice triads are not exactly like jelly–you don't spread them over things. On the contrary, they're more like hot sauce, as they are applied in a more "dashing" motion. Okay, now I'm getting hungry... but not for hot sauce jelly. Essentially, spread voice triads are chords, just with pieces missing. For example, if you play a root position minor 7 chord, and remove the 7th, you'll have a root position minor triad. Triads consist of three notes, and spreading them across the neck instead of stacking them on top of each other is a great asset to any songwriter or improvising guitar player's arsenal.