Musicologist here. There is a lot we don’t know about this, but there are many instances where song is significantly different than other language production for some reason. For example that we are much better at memorizing lyrics than other texts (even poems)
A lot of it comes down to how music activates many areas of the brain at once; memory, motor, language, etc. That might also be the case with why it helps with stuttering because two important factors of stuttering is interference between different parts of the brain and lack of coordination between the speech motor and planning regions of the brain.
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