There are the lives and works of the great composers; analyses of the most important works of classical music; introductions to all the most popular operas; A-Z of Classical Music and A-Z of Opera; an introduction to the instruments of the orchestra; and many others." - Naxos.com
The Naxos Educational series offers a very informative and enjoyable listening experience for both the new comers to classical music and veteran concert goers.
Here's the playlist: Naxos Educational: An Index (81 tracks from 81 albums). One track off every album, so that the list won't get too long. You can click the album title in the list to access any of the full album. In the A To Z of Pianists, You can hear the pianist who had heard Chopin himself play and played with Liszt, the French master Francis Planté who was born in 1839, playing piano, not on a roll! The Classic Explained and Life And Works series by Jeremy Siepmann(official site, his Spotify catalog) are surprisingly charming, you got to hear him sing the opening of the Pastoral Symphony.