Since you dig Opera (which I'll grab from the famous ones), and since you started with Mozart, which is considered "High Classical" music (late 18th early 19th century), I'm gonna give you some recommendations based on those two things. Mozart's other famous Operas are a great place to start: Don Giovanni - Mozart Le Nozzi Di Figaro - Mozart Die Zauberflöte - Mozart --- Otello - Giuseppe Verdi Aida - Verdi Messiah - G.F Handel (this is technically an Oratorio, but Handel desperately wanted to compose opera) Symphonies no. 100-104 - Haydn Symphonies no. 3,5,7,8,9 - Beethoven (love 6 as I do, it's not as accessible as the others. 9 is on this list exclusively for the last movement - It's a long-ass symphony so start there) Turandot - Puccini Madame Butterfly - Puccini Carmen - Bizet Sinfonia Concertante for Viola and Double Bass - Carl Dittersdorf Bass Concerto - J.B. Vanhal Check some of that stuff out. I love earlier (Baroque) and Later (Romantic) more than High Classical, but It's all great. Enjoy.
Thanks for the recommendations in regards to the opera. My interest in it really came out of nowhere. I've always had the deepest respect for the art, but it wasn't until recently that I've really begun to take more of an active interest in it. Thanks for the rest of the recommendations I will be spending my entire weekend assembling a very long playlist to begin my journey.