Shahana jee, gaanon ki to baat hi na karein, agar urdu poetry k rules par in gaanon ki shaairy ko parkha jaaye to hazaaron ghalatiyaan nikalti hain, so urdu poetry ko kisi gaane se compare karna bilkul sahi nahi hoga.
Or baat rahi imagination ki or matlab samajh mein aane ki to matlab to ek goonga shakhs bhi apne ishaaron se samjha leta hai, or is baat ki roshni mein to be-chaare chaha Ghaalib ka saara kalaam hi bogas saabit ho jaata hia k un k ash'aar k matlab samajhna barra mushkil hota hai. Maqsad sirf baat samjhaana nahi hota,,, bal-k she'r ka structure or usko baandhne k tareeqe bhi baraabar ki haisiyat rakhte hain. Hope i've cleared my point. (plz no offence)