Introit, from Messe Basse, Op. 30 -- Louis Vierne (1870-1937) Title: IntroitExcerpted from: Messe BasseOpus No.: IntroitComposer(s): Louis Vierne (1870-1937) Title: IntroitExcerpted from: Messe BasseOpus No.: IntroitComposer(s): Louis Vierne (1870-1937)