Litebrite your initial post is confusing. There is a difference between ‘classical ‘ music and instrumental. Some classical music pieces can be instrumental but there are other genres of music that can also be instrumental. Schubert is a famous classical composer who wrote music for a singer accompanied by a piano and in come cases choral music. (FWIW folks have a idee fixe that classical music is the likes of Lizt , Bach etc. and fail to understand that it is defined not only by the era (1730=1830) but also by the instruments of the period. )
Admittedly I’m of the generation that benefited from Young Peoples Concerts by Leonard Bernstein, you may want to view some of them (available on Amazon). They offer a wonderful music education. In particular, episode 5, ‘What is classical music?’.