Borodin and Mussorgsky are also good Russian composers. Pictures at an Exhibition, Promenade was the song that got me playing trumpet.

Jean Sibelius was Finnish, famous for Finlandia (bit of a giveaway) mostly, but his finale to symphony no 5 is pretty epic for brass.

I spend allot of time listening to early choral composers from the 16th and 17th centuries such as Luis de Victoria and Allegri if that counts as classical.