All the composition there are great but in particular the Devil's Trill which has a great story. which apparently is based from Tartini dream
"One night, in the year 1713 I dreamed I had made a pact with the devil for my soul. Everything went as I wished: my new servant anticipated my every desire. Among other things, I gave him my violin to see if he could play. How great was my astonishment on hearing a sonata so wonderful and so beautiful, played with such great art and intelligence, as I had never even conceived in my boldest flights of fantasy. I felt enraptured, transported, enchanted: my breath failed me, and I awoke. I immediately grasped my violin in order to retain, in part at least, the impression of my dream. In vain! The music which I at this time composed is indeed the best that I ever wrote, and I still call it the "Devil's Trill", but the difference between it and that which so moved me is so great that I would have destroyed my instrument and have said farewell to music forever if it had been possible for me to live without the enjoyment it affords me'
Yes the piece is stunningly beautiful that it could have been composed by the devil even though Tartini claimed "so inferior to what I had heard (in my dream), that if I could have subsisted on other means, I would have broken my violin and abandoned music forever."
Rameau - Pieces De Clavecin - So far the only solo harpsichord based work that I can enjoy
Vivaldi - L'estro Armonico - This set is in someways even better than the Il cimento dell'armonia e dell'inventione/Four seasons set. Sure it doesn't reach the emotional peak of the Four Seasons work especially the summer and winter set. However it doesn't have self-plagiarism inferior remake of the spring tune that continues after the Four Seasons. Each of the 12 concerto are good and importantly sounded unique without any obvious self plagiarism. It also contains the original version of Bach 4 harpsichord arrangement concerto with Vivaldi Concerto No.10 in B minor RV 580 . Bach certainly showed good taste in picking that one to do an arrangement of.
Vivaldi - Stabat Mater, Gloria - His sacred music is actually very very impressive and maybe even more than his concertos. It's less complex and emotionally powerful as a Bach or Handel sacred music but if you want a more melodically direct and tuneful version of sacred music, Vivaldi the man to listen to.
Gluck - Orfeo and Euridice and Alceste - I like Gluck's opera especially his integration of the choir with solo singers. It gives the opera more gravitas and emotional weight.
Francesco Cilea - Adriana Lecouvreur - Wow a 20th century opera that doesn't sound like Wagner or late period Verdi. Just good tunes in the Italian Bel Canto traditions.