There seems to be disagreement as to what this form is, but
that may be the difference between Arabic and Urdu interpretations. One definition seems to characterize the musaddas as having three feet in a line, with a
possible light syllable added.
Another version seems to say that it is a six-line stanzaic form with rhyme scheme aaaabb. At least one other version is that it uses the ghazal rhyme
scheme until the final couplet in the final verse, thus:
aa ba ca
da ea fa
ga ha ii