As in musical composers? Some of the most famous were Franz Liszt, Béla Bartók, and Zoltán Kodály, but Hungary has had countless composers. Examples of some lesser known are Erno" Dohnányi and Ferenc Farkas.
Composers as a group of people cannot be classified as any sexuality. There are many different composers, of which some could be gay. The majority are assumed to be heterosexual as 90% of the world's population is such.