  Accessibility in visualization is an important yet challenging topic.
Sonification, in particular, is a valuable yet underutilized technique that can
enhance accessibility for people with low vision. However, the lower bandwidth
of the auditory channel makes it difficult to fully convey dense
visualizations. For this reason, interactivity is key in making full use of its
potential. In this paper, we present a novel approach for the sonification of
dense line charts. We utilize the metaphor of a string instrument, where
individual line segments can be "plucked". We propose an importance-driven
approach which encodes the directionality of line segments using frequency and
dynamically scales amplitude for improved density perception. We discuss the
potential of our approach based on a set of examples.
