Love my classical music Paul, although I don't claim to know or heard everything. Of the top of my head I can honestly say I can't remember having heard Mendelssohn or the Fingals cave overture, I do have a lot of Classical music which I got into in the 90" s, Beethoven, Mozart, Bizet, Holst, Elgar, Vivaldi, Rimsky-Korsakov, Shostakovich, Dvorak, etc... Including some Opera. My favourite being Tchaikovsky.
Just find its taking music to another level, very emotional, relaxing and Heavy in a lot of pieces.