Wikipedia
Tarana-e-Milli or Anthem of the Community is an enthusiastic poem in which Allama Mohammad Iqbal paid tribute to the Muslim Ummah (nation) and said that nationalism in Islam was not recommended. He recognized all Muslims anywhere in the world as part of a single nation, whose leader is Muhammad,the prophet of the Muslims.
Iqbal wrote the poem a few years after writing a poem written in the same meter and rhyme scheme call Tarana-e-Hindi (More commonly known as Sare Jahan Se Accha). In this time, Iqbal's world view had changed dramatically, Tarana-E-Hindi is a patriotic song that glorifies the land of Hindustan (Modern day India, Pakistan and Bangladesh) and the people who live in it; it also suggests that people should not divided by religion and should instead be bonded by a common national identity. Tarana-E-Milli, on the other hand, argues that a global, Islamic community should come above all and even warns against a nationalistic world view. This reflects the dramatic change in Iqbal's views, and his support for the Muslim League and the Pakistan Movement