Why do Composers select particular keys for their music?

This is the first of five videos I will be making on the immense subject of musical key. If you wish to buy me a coffee, that would be appreciated: https://www.buymeacoffee.com/classicalmk Next Videos on Harmony: Key    • Harmony & Key, A guide for alien and human   Equal Temperament:    • How I learned to stop worrying and love Eq...   Progression of 5th:    • The Progression of 5ths - A journey throug...   Blue Harmonics:    • The Blues and Classical Music harmonics...   Favorite Key changes:    • The 5 Best Key Changes in Classical Music   And for a full introduction:    • Classical Music the Basics: 3. Harmony   ______________________________________________________________________ Seth Kadish's study on key can be found here: https://vizual-statistix.tumblr.com/p... Beethoven violin concerto    • Hilary Hahn performs Beethoven Violin Conc...   Brahms violin concerto    • 01 Brahms Violin Concerto, Julia Fischer (...   Sibelius violin concerto    • Sibelius : Concerto pour violon (Hilary Hahn)   Beethoven Pathetique:    • Video      • Beethoven: Symphony No.7: Second Movement ...   Bach prelude in C    • Video