After completion of work, Văn Cao met and let Vũ Quý try the song. Vũ Quý was very happy at his work, and "Tiến Quân Ca" was published in papers on November 1944 with lithographs by Văn Cao. On August 17, 1945, the song was sung for the first time at a rally of civil servants in Hanoi by a Ph.D under the flag of the Việt Minh, and "robbed the loudspeakers". Văn Cao quoted, "That quiet man was an attraction to thousands of people listening that day". The poet and musician Nguyễn Đình Thi was touched after hearing Văn Cao sing the song and asked each person to write another song for "The Viet Minh Frontline". He posted his own "Diệt Phát Xít", meaning "Killing Fascists". Văn Cao wrote "Chiến Sĩ Việt Nam", meaning "Vietnam Soldiers". Both songs are still popular and sung to the public today. On August 17, 1945, Hồ Chí Minh approved Tiến Quân Ca to be officially recognized as the anthem of the Democratic Republic of Vietnam. On September 2, 1945, marching was officially performed on the day of the Proclamation of Independence at Ba Đình Square by the Liberation Army band commanded by . At the day before the performance, musicians Dinh Ngoc Lien, Nguyen Huu Hieu, and Văn Cao discussed for changing the two words in "Tiến Quân Ca" in order to shorten the song by shortening the length of the first E pitches in the word "đoàn" and the F in the middle of the word "xác" to make the song more "snappy". In 1946, the 1st National Assembly officially recognized "Tiến Quân Ca" as the national anthem. In the first Constitution of the Democratic Republic of Vietnam in Article 3, it states directly about the national anthem. In 1955, the 5th session of the first National Assembly decided to invite authors to participate in another editing of the song. Văn Cao had regrets after this because the "heroic spirit" of the song had been lost after being edited.