Brass solos?

which instruments take lead? song examples anything will help. orchestral genre.

I don't know of anything off the top of my head that has a brass solo other than concertos for brass instruments, but I would imagine in a brass solo that either the horns or the trumpets or both would be taking the lead most of the time and that the rest of the time, it would be trombones taking the lead, and the tuba is left to give bass line accompaniment.

Check out Mars, by Gustav Holst. A great orchestral piece dominated with brass leads. 

Score located here: https://imslp.org/wiki/Special:ImagefromIndex/05396/hfne

the opening of Mahler's 5th symphony

Mozart’s requiem, tuba mirum Movement.

@Tónskáld Definitely off to a good start with the brass section. 

Overall I'm looking to create something with more action, abrupt sounding with varied articulations. Probably alternating to strings with leads to return to a stringed chorus.