  Breath is a significant component in singing performance, which is still
underresearched in most singing-related music interfaces. In this paper, we
present a multimodal system that detects the learner's singing pitch and
breathing states and provides real-time visual tutoring feedback. Specifically,
the breath detector is a wearable belt with pressure sensors and flexible
fabric. It monitors real-time body movement of the abdomen, back waist, and
twin ribs. A breath visualization algorithm is developed to display real-time
breath states, together with the singing pitch contours on an interactive score
interface. User studies show that our system can help users not only gain
deeper breath during singing but also improve pitch accuracy in vocal training,
especially for those with some musical background.
