Misc: Who appeared on the back of the $20 bill in 1875?

Questions

Classical Music : He wrote over 100 symphonies...and he created the string quartet.?

Classical Music : His principal works are the operas Wozzeck & Lulu.?

Classical Music : Schumann's wife hung around him after her husband Robert Schumann died.?

Classical Music : The Love Theme from Elvira Madigan is this number piano concerto.?

Classical Music : This composer was a pupil of Beethoven & a teacher of Liszt.?