CLAIR MARLO - Let It Go! Any format is good.
+1 a Sheffiel Lab recording and great performance.
TCHAIKOVSKY Sérénade mélancolique Op.26 with Gidon Kremer from DG, great performance but not a perfect recording, however this CD is a reference very good to rate audio equip.
https://www.youtube.com/watch?v=XxSffY96IH0The Four Season-Vivaldi are redundant but inevitable in audio show as the public know these pieces, Lorin Maazel conducting are a suitable version.
THis is a new very exciting Four Seasons version re-composed by Max Richter in the contemporary style>
https://www.youtube.com/watch?v=8oYWfJuMGMAIt will do great efffect in a HiFi show, the music is new and old at the same time.