I began to write what I called 'rhythms' ie unrhymed pieces with no formal metrical scheme where the rhythm was created by a kind if inner chant. . Later I was told I was writing 'free verse' or Vers libre.
BLANK-VERSE, n. Unrhymed iambic pentameters - the most difficult kind of English verse to write acceptably; a kind, therefore, much affected by those who cannot acceptably write any kind.