Musicians and music students struggle to quickly identify the tonal center when reading unfamiliar sheet music

Musicians waste time analyzing harmonic progressions and melodic patterns to determine what key a piece is in, since standard notation doesn't explicitly mark the tonal center. This is especially painful for sight-readers, music students learning theory, and musicians performing in unfamiliar genres. Current solutions (inferring from key signatures, analyzing chord progressions) are slow, error-prone, and require significant music theory knowledge.