What are the legal proofs relied upon by those who deem singing unlawful, and how have some jurists discussed them?

The prohibition of singing is established by sufficient evidence. The noble verse: {And among the people is he who buys the amusement of speech to mislead from the way of Allah} [Luqman: 6] was revealed concerning the prohibition of selling and buying singing slave girls. The noble Hadith: "There will be people among my Ummah who will consider unlawful sexual intercourse, silk, intoxicants, and musical instruments as lawful" is authentic and well-connected. Al-Bukhari may report a Hadith in a suspended form for reasons that do not negate its connection. The mention of musical instruments (ma'azif) alongside intoxicants, unlawful sexual intercourse, and silk indicates their prohibition, whether "considering lawful" (istihlal) refers to believing in their permissibility or its metaphorical meaning. There are other pieces of evidence, such as the Prophet's (PBUH) saying: "Indeed, Allah has forbidden to me – or has forbidden – intoxicants, gambling, the kuba, and every intoxicating substance is unlawful." And the kuba is the drum.