Curnen couldn't help smiling at his enthusiasm; it was adorable and infectious. "You normally only get one pitch at a time when you sound a string," she said, folding the word he needed into her explanation, demonstrating by plucking one of the strings, moving her fingers further down the frets. "And the lower down the neck you go, the higher the pitch you make. With a slide, you well, can slide from high pitches to low and back again."