 Unheighted neumes only indicate whether a given note is pitched higher or lower than the preceding note, without giving any indication of how much change in pitch there is between two notes, so they are useful only as mnemonic devices for singers who are already familiar with the melody.However, it is possible to identify many of those melodies by comparing them with melodies notated in staffed neumes in other contemporary manuscripts from the schools of Notre Dame and Saint Martial.Between 1935 and 1936, German composer Carl Orff composed music, also called "Carmina Burana", for 24 of the poems.