Musician uniform?

[major bill]

This is a image of a Michiagn soldier in the 4th Infantry Regiment. Can anyone help me decide what I am seeing?

Some background information on this soldier. He was to young to be accepted as a soldier so joined as a musician. The 4th Michigan was originally issued gray nine button roundabout jackets. This could well be him in his issued jacket with braid added to the chest to turn the jacket into a musician's jacket. Another possibility is this is a private purchased militia uniform. When the war started his town formed a home guard company, the Hudson Zouave Cadets, of boys too young to join the army. The fancied themselves as a Zouave company but only wore blue shirts, red Zouave trousers, and red Zouave caps (fez or kepi?). This young man was a musician in that Zoauve company but soon joined the 4th Michigan. After the War he was in Michiagn militia companies. He served in the Spanish American war and World War One.

It is possible that he wore the uniform in the photograph as a musician in the Zouave company, but his braided jacket does not look very Zouave to me. I am leaning towards custom musician's jacket, but it could be a 4th Michigan Infantry gray roundabout turned into a triple breasted jacket and with added braid and new contrasting color collar, but I do not see the epaulettes the jacket should have. It would almost have been easier to get a new jacket rather than do so much conversion on his issued jacket. Do you think this is a custom musician's jacket and not a gray roundabout with braid added? Is this a post war Militia company uniform? He would have been 20 years old at the end of the war and he could be in his early 20s in the photograph.