Is the Islamic anthem a bid'ah (innovation), and what is the response concerning the anthem "Tala'a al-Badru 'Alayna" and the poetry of Hassan ibn Thabit, and is it permissible to introduce new matters that are not acts of worship for the sake of benefit, as 'Umar (may Allah be pleased with him) did?

There is no harm in listening to anashid (Islamic chants/songs) as long as they do not contain anything forbidden in their lyrics, or are not accompanied by musical instruments, and do not involve imitation of the wicked and dissolute, or distract a person from their duties. However, if they are listened to as a means of drawing closer to Allah, and it is believed that they are a legitimate way to spiritual happiness, or a means of purifying the soul, then this is a reprehensible innovation (bid‘ah). What was mentioned about 'Umar ibn al-Khattab, may Allah be pleased with him, has no relation to the issue of innovation; rather, it falls under the category of acting upon a legitimate principle, or maslahah mursalah (unrestricted public interest), or siyasah shar'iyyah (Islamic governance/policy).