Final answer:
Mussorgsky and his musical colleagues were not dedicated to developing an authentically Austrian means of musical expression. They were part of the Russian nationalist movement in music, known as The Mighty Handful.
Step-by-step explanation:
No, Mussorgsky and his musical colleagues were not dedicated to developing an authentically Austrian means of musical expression. They were actually part of the Russian nationalist movement in music, known as The Mighty Handful. This group, which included composers like Mussorgsky, Balakirev, and Rimsky-Korsakov, aimed to create music that reflected the unique cultural and folk traditions of Russia.