All perfect praise be to Allaah, the Lord of the worlds. I testify that there is none worthy of worship except Allaah and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and Messenger.
As agreed upon by the Muslim scholars, singing is prohibited if it is associated with musical instruments, excluding the duff (a tambourine-like instrument without bells). This opinion was reported from a group of Muslim scholars by Al-Qurtubi. Singing is also prohibited if a female does so in front of non-mahram (permanently unmarriageable) men or if the song contains prohibited content such as erotic lyrics or an invitation to fornication. Singing that is void of these prohibitions, however, is permissible. Even so, it is unfavorable to spend much time listening to songs, especially in Ramadan, when a Muslim is rather encouraged to engage in as many righteous deeds as possible—not to waste time, which is most precious thing one has, in listening to songs, even though they are permissible. That being said, the fact that one listens to forbidden music after the Taraaweeh prayer does not change the relevant ruling. In fact, such a type of singing is forbidden whether the person is fasting or has broken his fast and whether one indulges in it during the day or the night of Ramadan. This is because Ramadan is a blessed month and all its times have great merit and are of high standing.
Allaah Knows best.