Gosh, Julie, you've just listed almost all my favourites as well. Rodrigo's Concierto de Aranjuez is a stunning piece of music, and with Holst, is my favourite 20th century music. We used to sing 'I Vow To Thee My Country' at school, but listening to Jupiter always makes my hair stand on end.
I also love Bach, Mozart, Schubert, Beethoven and Brahms (especially the Violin Concerto), and Mendelssohn's Nocturne from The Midsummer's Night Suite because my son played it on the French horn for an exam, before he gave up.
TL, sounds like your boyfriend has good taste. I'm sure he could be persuaded to like our guys!