These works are rather unusual and analyzing them is not always easy. However, they seem quite acceptable and have certainly been warmly, and widely, accepted by the public.

Edelweiss
     - by Oscar Hammerstein II and Richard Rogers, 1959
Details

Greensleeves
     - Folklore Anon
Details

Mack The Knife
     - Kurt Weill, 1928
Details

Second Prelude For Piano
     - George Gershwin, 1927
Could it possibly be in C# major rather than in C# minor?