Do any of your muses have good singing voices?
~~~Hello, and thank you for this question! Yes, I'm answering this way cause I realize that, unless the anon is spicy enough to need to be under a cut, this probably makes more sense so you Nonny's can be notified of my response!
So, I'll start by saying this. None of them have bad singing voices, but most of them aren't passionate singers either, and only one of them has had any level of training, and another was simply self taught and did it only in rare company.
And as an addition, I really don't know enough about singing and such to know what type they would be, so my description is a little limited/is without more fitting terms, I apologize!
Aurelia: Very unlikely to sing freely, the most she ever did was hum tunes, if she was ever inclined. At times it may have been comforting, or a way to block out unbearable silence. But that's not a way she's ever expressed herself, or been driven to, and she's unlikely to sing. So she has an average voice.
Kadaj: Rather similar to Aurelia, not likely to be much of a singer, ya know, and not one to be very inspired to sing at that. The most he may have done, was sing under his breath while thinking, plotting, or working, and that's only occasionally. And it would be nonsense to most, as it's flickers of things he heard from memories in the Lifestream. His voice would be sort of soft, but hold a sort of boyish attitude sound to it if he really put any power behind it. Still, average as well, and not one to sing much.
Reno: Reno isn't bad at all, really. He just likes to sing obnoxiously, and/or usually to bug someone. So he certainly usually SOUNDS horrible because he sings loud and off key. Any other singing is either him being flirty or competitive during karaoke, or just singing to himself when he gets a song stuck in his head. Not a very deep voice but not soft either, and is the type of voice to have fortunate and unfortunate voice cracks and shakes that add or take away from his singing.
Vincent: His mother and grandmother casually sang often at home. His grandmother moreso, but she adored his mothers sweet voice and encouraged her to sing, which eventually led to them both teaching Vincent for a while. It wasn't a great interest of his, but it was time with his mother and grandmother and they seemed very pleased listening to his sweet little voice, so he's probably one of the best/most trained voices. A reasonably deep voice, as well as raspy, when he sings now. But he doesn't sing anymore, apart from humming when someone needs the comfort, or unless someone who happens to have a direct like to his weak spot of emotions can convince him to.
Sephiroth: He was self trained, and so his singing capabilities are imperfect, but honestly, that gives his vocals a lot of their power and appeal in sound. It started with fooling around with his fellow SOLDIERs and became a habit on their few prolonged days of down time where they'd stay with one another. Whether it was competition, or just goofing off. He might be inclined to casual singing nowadays. His voice is very deep, a voice you could feel in your chest, and has the ability to be soothing and enchanting, as well as chilling and haunting.