Mine is the Romantic Era. It had Tchaikovsky, Chopin, Schubert and Brahms. Those are some of my favorite composers.
Examples for (not) each era (due to max of 4 vids):
Baroque (1600 - 1760)
Classical (1730 - 1830)
Romantic (1815 - 1910)
20th + 21st Century (1901 - 2000) (Does also include composers like John Williams and Howard Shore)