 Instrumentalists who begin sight-singing for the first time in college as music majors find movable do to be the system more consistent with the way they learned to read music.For choirs, sight-singing fixed do using chromatic movable do syllables (see below) is more suitable than sight-singing movable do for reading atonal music, polytonal music, pandiatonic music, music that modulates or changes key often, or music in which the composer simply did not bother to write a key signature.It is not uncommon for this to be the case in modern or contemporary choral works.