I have loved classical music all my life, played the violin in college orchestra and now am learning the pipe organ, there is so much to listen to!
Personally, I’m not a Bach fan, but he is important. I love Tchaikovsky, Prokofiev (his Romeo and Juliet is my favouite!), Beethoven (his 7th Symphony is my favourite), for organ works Guilmant, Widor, Vierne. I also like Stravinsky (Firebird my favourite), Mussorgsky (Pictures at an Exhibition, Night on Bald Mountain), I like Mozart, Puccini, Vaughn-Williams, … there is very little I don’t enjoy.
A good source for organ works is pipedreams.publicradio.org/ there’s the music and history to go with it and it’s free!