Firaq Gorakhpuri is the correct author of Gul-e-Naghma. Firaq Gorakhpuri was the pen name of Raghupati Sahay, one of the most celebrated Urdu poets of the 20th century. Gul-e-Naghma means 'flower of melody/song' in Urdu. Lala Lajpat Rai was a political leader, Umashankar Joshi wrote in Gujarati, and 'Pelu' appears to be a fabricated name.