Some Muslims think that in Islam music and singing are completely forbidden or only some musical instruments are allowed.
The Quran does not clearly forbid music or singing. Many sounds of nature can be considered music, e.g. the sound of waves on the shore or birds chirping. The human voice box is simply another musical instrument of nature.
The Quran itself is written in a rhythmic/melodic style, and when it challenges others to bring a chapter like it [e.g. 10:38], this shows that it at least allows imitation of this style to take place.