She possesses a three-octave vocal range, spanning from B2 to E6. She once claimed to be a mezzo-soprano. However, attempts to adapt classical voice types to other forms of singing have been met with controversy. Without making a classification, Kent Nagano, maestro of the Munich Symphony Orchestra, remarked, "All you just sang was full lyric soprano", after Dion auditioned with two solos from "Carmen", wanting to know if she could sing opera. Her timbre has been described as "thin, slightly nasal" with a "raspy" lower register and "bell glass-like high notes".