The poetic content of the bhajan also covers a broad spectrum.   The more traditional ones by great saint musicians such as Mira, Surdas, or Kabir are considered to be of the highest literary quality.   Many modern ones, although more easily understood by the masses, usually have a literary value no greater than a typical film song (a popular form of music generated for the masses).   

The lowest poetic form is the dhun, which is actually nothing more than a musical version of a chant.  The structure of bhajan is very conventional.   It contains a single sthai and numerous antara.   The last antara has special significance because it contains the nom de plume of the author.