Crossword puzzle clue "noted composer charles who in his lifetime few even knew"

Noted composer Charles who, in his lifetime, few even kneW

Only U.S. president to have his portrait on a coin during his lifetime

"Even *I* knew that!"

"The ___ have shown me more ways to lose than I even knew existed." (Casey Stengel)

He knew his cetacean in life

George Bernard Shaw wanted his to read "I knew if I stayed around long enough, something like this would happen"

Sydney who knew his zodiac signs (12)

He knew his right triangles