Background of how the national anthem of India was born
Netaji established "Free India Centre" in 1941 when he was in Germany. This lead to "Indian Army –banished army–", and also lead to the provisional government of Free India. "Free India Centre" was officially accepted by Germany, Italy, and Japan.
"Free India Centre" had a flag. It was quit similar to the current national flag of India, but a springing tiger was drawn in the centre. They brought a custom of a salutation saying "Jai Hind! (Glory be to India!)". But "Free India Centre"didn’t have an anthem. Netaji made a decision after discussions that "Jana Gana Mana" to be the anthem.
Indo–German Association was established on 11th of September 1942 in front of Netaji, the Mayer of Hamburg, Diplomats, Government Officers, and Celebrities. "Jana Gana Mana"was played together with the national anthem of Germany by the Radio Hamburg Orchestra.
India didn’t have the national anthem when set up on 15th of August 1947.
The delegation of Indian government dispatched to the UN conference in New York in 1950 brought the "Jana Gana Mana" recorded in Singapore, and hand it to UN orchestra. Then it was played together with anthems of other nations.
"Jana Gana Mana" was applauded by the audience. The delegates reported it to the prime minister NEHRU and his cabinet membres. Then the "Jana Gana Mana" was assigned to be the national anthem of India because there was no other options before the Republic Memorial Day on 27th of January.