Help reading a name, occupations and a relationship term

BetteB

This is the second page of a civil marriage registration from Hürth, Regierungsbezirk Cöln in 1842. I am doubting myself on the given name of the first witness to the marriage. I know the surname is Rosenbaum but is the given name Martin or something else?

I am having trouble for the occupation of that same witness, which looks like the witness Gottfried may have the same occupation. Maybe musician?

And for another witness. I know he is some kind of "smith".

Finally, the relationship to the groom.

Thanks in advance for your help!!!

JohnsonGreg

I see it as Martin; Musikus (musician) ; Nagelschmidt (nail maker) and bruder (brother).

BetteB

Thank you so much. I couldn't figure out Nagelschmidt and I appreciate that insight. Wow! I didn't get "Bruder". I really appreciate your help!!!